Tagging with projects would be great too, but we were really thinking of arbitrary tags not limited to the set of projects. (One example might be an "onboarding" tag; it's a word that's used in a few different contexts, so it would be pretty valuable to easily narrow in on just a subset -- e.g. pages intending to help new engineers onboard onto the team, which doesn't have an associated project.)

[angie initially submitted this for me because I didn't have an account, but I'm the original requestor]