There are plenty of technical Q&A web sites out there.  We've all used them at one time or another, if not daily. Most often, I used sites, mailing lists and forums set up specifically for some tool I'm currently working with. In the past year, I've spent time on the Apache mailing lists, the Codehaus support forums for some open source projects, and of course on our own Peer2Peer developer community. Sites specific to a toolset or product like Peer2Peer tend to be focused and valuable.  However, generalist Q&A sites tend to devolve due under the Usenet effect and experience a high noise to signal ratio. Doesn't it drive you crazy to have to wade through piles of junk to find the golden nugget? I've been  tooling about on the "Internet" since the early 1980's, and I shudder to think how much time I've spent being the physical embodiment of a regular expression filter, looking for the right answer among the non-matches.

Recently I found out about Stack Overflow, a generalist programming Q&A site that gets it right.