Under the hood we actually use IP.Board for our forums, IP.Blog for our journals, IP.Nexus for our subscriptions, IP.Downloads for the Marketplace, and IP.Content for just about everything else (front page, news, resources, dictionary, books, developer events, IOTD, showcase). While I feel somewhat like one of those Apple fanboys when I post this (you know you are one if you drool over every new thing Apple comes out with), Drew thought it would be a good idea to give you guys a heads up.
You can see the interface is much more streamlined and they have gone to great lengths to remove a lot of the cruft that they added with version 3.1. We are most likely seeing this new software integrated into our site sometime Q4 of this year. We need to do this to allow the dust settle on this major revision and give IPS a chance to iron out a lot of the bugs before we throw it onto you guys. We're really looking forward though to new features like tagging and prefixes to help us begin to organize content across our site in a better way than just the strict category format we use now.
Here is the full list of changes:
http://community.invisionpower.com/topic/331533-whats-new-in-ipboard-320-and-related-apps-so-far/
So what do you guys think? Check out their site.