Mailing lists and USENET newsgroups are the primary places I go for specific information. Remember ASCII? In Internet message format? Yeah, those old things. USENET has the massive advantage of being an anarchy - there's no publisher who can squelch your messages; each user can decide to killfile you or not, based on your apparent cluefulness. Mailing lists have the advantage of being very focused (they don't work when they become more broad-focus), and having guaranteed delivery.
Web-boards, even fairly nice ones like K5 and even /., aren't nearly as powerful or as easy to use as either of those. They're easier to get into in the first place, but as /.'s anonymous coward problem has shown, that's not always a good thing.
For general industry news, I go to the Web. Every day, I read The Register, Linux Today, Ars Technica, and Fucked Company. This is not an unbiased selection (to say the least...), but it gives me the info I really need most of the time.
Web sites are, IMO, best suited for publishing information that is expected to remain visible for a long time. Discussion with multiple rounds of post and reply is painfully difficult; here, you have to go to User Info and check to see if there are a different number of replies to any posts than there were the last time you looked, if you have an eidetic memory and can remember that kind of trivia. WikiWikiWeb is an incredibly neat concept, but has the "Are there any followups? I DON'T KNOW!" problem even worse. So K5's model, or Wiki, are an intermediate stage; /. is too volatile, and its software too primitive, to handle the volume of articles and responses it gets. Over a year ago, I basically gave it up except for browsing the headlines every few days. It's taken a lot of time and effort to make something even as advanced as scoop, and it's not half as powerful as the combination of slrn and an nntp server, or even procmail, mutt, and majordomo (actually, I use mailx, not mutt. Yeah, I'm a fossil.)
I've been tinkering with my own web-board software to try to deal with this issue (mainly to clarify my own thoughts on the matter), and it's an incredibly tough problem, but I'm convinced that it IS solvable, and it MUST be done if we're to make better virtual communities than these.
-- Mark Hughes