I like the "What's going on" block. I think that the "block" of online users in the sidebar it's not very important. Users doesn't need to know every second what users are online...the botton position is better imho.
I didn't make this thread to talk about vB, I made it to see his design. Doesn't matter what forum software it is, I just wanna see his work. Xenforo is so awesome that it makes you curious about what came before.