Joomla Answers is a Stack Exchange proposal to have an own SX site for Joomla related questions like Stack Overflow.
The proposal is currently in its Commitment state, and you can help bring it into Beta. I think it would be a great ressource for troubleshooting Joomla problems. Better than asking in the official forum or the Google groups.
If you think this is a good suggestion, go to the Area51 site and commit yourself to the proposal. It also doesn't hurt if you are active on any other Stack Exchange site and have or build up some reputation.
There is also a discussion going on in the CMS Google group initiated by Nils Rückmann.