Various cabal groups, such as pmdev, have their own internal "to-do" wikis... but in fact, all of these are stale. They probably contain lots of good ideas which people raised years ago, so I wouldn't say they're completely worthless in their current state.

I recently went through the pmdev to-do wiki and deleted all of the items which are "done" or "OBE" (no longer relevant). I then added all of the things I've been collecting on my personal pmdev to-do list. So, hopefully, the pmdev to-do wiki is now not completely worthless. :-)