I am a member of a few sites that use vBulletin, my favorite been:
They have a module/block at the top of their forum page that shows the Current Discussions Activity, a list of the latest 7 new threads, and the 7 latest replies.
I think this site would benfit from something like this.
THE only problem I see is that this site id aimed at a wider audience, and there will no doubt be members that really aren't interested in the latest post in the C++ area.
I do think this is a pretty good, site, but the threads are too nested in my personal opinion. (I am no expert, and I would never claim to be)
I think it would be a good idea for users that can contribute to multiple areas throughout the site.
Just an opinion