diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1957,6 +1957,7 @@
     'PhabricatorProjectEditPictureController' => 'applications/project/controller/PhabricatorProjectEditPictureController.php',
     'PhabricatorProjectEditorTestCase' => 'applications/project/editor/__tests__/PhabricatorProjectEditorTestCase.php',
     'PhabricatorProjectIcon' => 'applications/project/icon/PhabricatorProjectIcon.php',
+    'PhabricatorProjectInterface' => 'applications/project/interface/PhabricatorProjectInterface.php',
     'PhabricatorProjectListController' => 'applications/project/controller/PhabricatorProjectListController.php',
     'PhabricatorProjectMembersEditController' => 'applications/project/controller/PhabricatorProjectMembersEditController.php',
     'PhabricatorProjectMembersRemoveController' => 'applications/project/controller/PhabricatorProjectMembersRemoveController.php',
@@ -1975,6 +1976,7 @@
     'PhabricatorProjectTransaction' => 'applications/project/storage/PhabricatorProjectTransaction.php',
     'PhabricatorProjectTransactionEditor' => 'applications/project/editor/PhabricatorProjectTransactionEditor.php',
     'PhabricatorProjectTransactionQuery' => 'applications/project/query/PhabricatorProjectTransactionQuery.php',
+    'PhabricatorProjectUIEventListener' => 'applications/project/events/PhabricatorProjectUIEventListener.php',
     'PhabricatorProjectUpdateController' => 'applications/project/controller/PhabricatorProjectUpdateController.php',
     'PhabricatorProjectWatchController' => 'applications/project/controller/PhabricatorProjectWatchController.php',
     'PhabricatorQuery' => 'infrastructure/query/PhabricatorQuery.php',
@@ -4809,6 +4811,7 @@
     'PhabricatorProjectTransaction' => 'PhabricatorApplicationTransaction',
     'PhabricatorProjectTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorProjectTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
+    'PhabricatorProjectUIEventListener' => 'PhabricatorEventListener',
     'PhabricatorProjectUpdateController' => 'PhabricatorProjectController',
     'PhabricatorProjectWatchController' => 'PhabricatorProjectController',
     'PhabricatorRecaptchaConfigOptions' => 'PhabricatorApplicationConfigOptions',
diff --git a/src/applications/project/application/PhabricatorApplicationProject.php b/src/applications/project/application/PhabricatorApplicationProject.php
--- a/src/applications/project/application/PhabricatorApplicationProject.php
+++ b/src/applications/project/application/PhabricatorApplicationProject.php
@@ -32,6 +32,12 @@
     );
   }
 
+  public function getEventListeners() {
+    return array(
+      new PhabricatorProjectUIEventListener(),
+    );
+  }
+
   public function getRoutes() {
     return array(
       '/project/' => array(
diff --git a/src/applications/project/events/PhabricatorProjectUIEventListener.php b/src/applications/project/events/PhabricatorProjectUIEventListener.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/events/PhabricatorProjectUIEventListener.php
@@ -0,0 +1,59 @@
+<?php
+
+final class PhabricatorProjectUIEventListener
+  extends PhabricatorEventListener {
+
+  public function register() {
+    $this->listen(PhabricatorEventType::TYPE_UI_WILLRENDERPROPERTIES);
+  }
+
+  public function handleEvent(PhutilEvent $event) {
+    switch ($event->getType()) {
+      case PhabricatorEventType::TYPE_UI_WILLRENDERPROPERTIES:
+        $this->handlePropertyEvent($event);
+        break;
+    }
+  }
+
+  private function handlePropertyEvent($event) {
+    $user = $event->getUser();
+    $object = $event->getValue('object');
+
+    if (!$object || !$object->getPHID()) {
+      // No object, or the object has no PHID yet..
+      return;
+    }
+
+    if (!($object instanceof PhabricatorProjectInterface)) {
+      // This object doesn't have projects.
+      return;
+    }
+
+    $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
+      $object->getPHID(),
+      PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+    if ($project_phids) {
+      $project_phids = array_reverse($project_phids);
+      $handles = id(new PhabricatorHandleQuery())
+        ->setViewer($user)
+        ->withPHIDs($project_phids)
+        ->execute();
+    } else {
+      $handles = array();
+    }
+
+    if ($handles) {
+      $list = array();
+      foreach ($handles as $handle) {
+        $list[] = $handle->renderLink();
+      }
+      $list = phutil_implode_html(phutil_tag('br'), $list);
+    } else {
+      $list = phutil_tag('em', array(), pht('None'));
+    }
+
+    $view = $event->getValue('view');
+    $view->addProperty(pht('Projects'), $list);
+  }
+
+}
diff --git a/src/applications/project/interface/PhabricatorProjectInterface.php b/src/applications/project/interface/PhabricatorProjectInterface.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/interface/PhabricatorProjectInterface.php
@@ -0,0 +1,5 @@
+<?php
+
+interface PhabricatorProjectInterface {
+
+}
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -163,6 +163,10 @@
       $types[] = PhabricatorTransactions::TYPE_TOKEN;
     }
 
+    if ($this->object instanceof PhabricatorProjectInterface) {
+      $types[] = PhabricatorTransactions::TYPE_EDGE;
+    }
+
     return $types;
   }
 
@@ -1079,6 +1083,7 @@
 
     // TODO: For now, this is just a placeholder.
     $engine = PhabricatorMarkupEngine::getEngine('extract');
+    $engine->setConfig('viewer', $this->requireActor());
 
     $block_xactions = $this->expandRemarkupBlockTransactions(
       $object,
@@ -1098,11 +1103,41 @@
     array $xactions,
     $blocks,
     PhutilMarkupEngine $engine) {
-    return $this->expandCustomRemarkupBlockTransactions(
+
+    $block_xactions = $this->expandCustomRemarkupBlockTransactions(
       $object,
       $xactions,
       $blocks,
       $engine);
+
+    if ($object instanceof PhabricatorProjectInterface) {
+      $phids = array();
+      foreach ($blocks as $key => $xaction_blocks) {
+        foreach ($xaction_blocks as $block) {
+          $engine->markupText($block);
+          $phids += $engine->getTextMetadata(
+            PhabricatorRemarkupRuleObject::KEY_MENTIONED_OBJECTS,
+            array());
+        }
+      }
+
+      $project_type = PhabricatorProjectPHIDTypeProject::TYPECONST;
+      foreach ($phids as $key => $phid) {
+        if (phid_get_type($phid) != $project_type) {
+          unset($phids[$key]);
+        }
+      }
+
+      if ($phids) {
+        $edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $block_xactions[] = newv(get_class(head($xactions)), array())
+          ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
+          ->setMetadataValue('edge:type', $edge_type)
+          ->setNewValue(array('+' => $phids));
+      }
+    }
+
+    return $block_xactions;
   }
 
   protected function expandCustomRemarkupBlockTransactions(
@@ -1899,13 +1934,12 @@
       $has_support = true;
     }
 
-    // TODO: This should be some interface which specifies that the object
-    // has project associations.
-    if ($object instanceof ManiphestTask) {
+    // TODO: The Maniphest legacy stuff should get cleaned up here.
+
+    if (($object instanceof ManiphestTask) ||
+        ($object instanceof PhabricatorProjectInterface)) {
 
-      // TODO: This is what normal objects would do, but Maniphest is still
-      // behind the times.
-      if (false) {
+      if ($object instanceof PhabricatorProjectInterface) {
         $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
           $object->getPHID(),
           PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
diff --git a/src/infrastructure/markup/rule/PhabricatorRemarkupRuleObject.php b/src/infrastructure/markup/rule/PhabricatorRemarkupRuleObject.php
--- a/src/infrastructure/markup/rule/PhabricatorRemarkupRuleObject.php
+++ b/src/infrastructure/markup/rule/PhabricatorRemarkupRuleObject.php
@@ -7,6 +7,7 @@
   extends PhutilRemarkupRule {
 
   const KEY_RULE_OBJECT = 'rule.object';
+  const KEY_MENTIONED_OBJECTS = 'rule.object.mentioned';
 
   abstract protected function getObjectNamePrefix();
   abstract protected function loadObjects(array $ids);
@@ -188,6 +189,12 @@
       }
     }
 
+    $phids = $engine->getTextMetadata(self::KEY_MENTIONED_OBJECTS, array());
+    foreach ($objects as $object) {
+      $phids[$object->getPHID()] = $object->getPHID();
+    }
+    $engine->setTextMetadata(self::KEY_MENTIONED_OBJECTS, $phids);
+
     $handles = $this->loadHandles($objects);
     foreach ($metadata as $key => $spec) {
       $handle = $handles[$spec['id']];