Recently a new programming/IT site went into public beta (created by industry notables Jeff Atwood and Joel Spolsky), it’s called Stack Overflow.
I’m quite fond of the concept, and it seems to be an interesting forum for posting very specific technology questions, or a good way to pose interesting questions to the technology community at large.
In fact, the concept sort of reminds me of an internal mailing list we have where I work (albeit without voting powers)!
If you have experience or are looking for answers, I think contributing to the site is a worthwhile venture from time to time. It’s really interesting reliving technology areas I haven’t used in quite some time (e.g. C++) and some of the less specific questions have amusing answers to read..