Stillmaintained has been running since November 2010 and we're currently hosting more than 6700 project pages.
The problem we were trying to solve was to get more information about open source project maintenance statuses. We partially achieved this goal, since a lot of people created status pages for their projects. A problem we're facing now is that people don't come back to update their projects' statuses after it changed, resulting in information that's out of date, and that's even worse than no data at all.
Of course, this problem could be solved by keeping an eye on commit dates and such, but the project lost a lot of momentum over the last couple months. The amount of projects being registered and the amount of contributions by the community dropped drastically. Also, I'm currently too busy with other things to keep investing time in it.
I guess the quest for a better way to keep an eye on open source maintenance status will have to continue. Starting something? I'd love to be involved in one way or another.