I don't visit Apple forums often (compared to MacNN), but when I did recently I got curious about what they use as a forum engine (seeing "category.jspa?categoryID=188" at end of their URL).
So... they don't use vBulletin (or, apparently, any php/MySQL-based process). Glancing at their source code wasn't too revealing (except for disclosing their heavy use of Omniture's SiteCatalyst).
At least I'm not seeing ".asp" in the URLs.
Those of you with broader db experience: what does it look like Apple's using? is it done via webobjects? ...some custom process they developed?