Yeah, I've been using Office 2007 Beta for about a month now and it seems pretty good. I'm really digging the 'ribbon' interface, mostly because it's more graphical than before. Makes things a little slicker overall. It's also been pretty stable with Excel crashing once in this month of using it.
The only thing at this point that I can fault it is that I still have to save most of my files in the 2003 version since the assignments I upload need to be able to be opened by older versions of Office apps.
What's with the spam posting? In some forums that would definitely be a reason for at least a temporary kick...