Re: threaded forum ?
Wow, those people have been around forever. I remember when Linux was first going public and I worked with Linux.com, those guys had the exact same list of products.
The web has moved away from threaded discussion formats in favor of conversational (due in part to comments becoming so prevalent on web sites and eventually blogs). There were numerous papers on it years back, though they may be hard to find now. Here’s one blog post on the subject, which does an adequate job of explaining some of the pros and cons: http://climbtothestars.org/archives/2008/06/02/against-threaded-conversations-on-blogs/
It can be accomplished with bbPress, with a little elbow grease, but I definitely don’t think it should rate on the list of core upgrades included in the next release.