Just spent the last hour playing around with the new Dashboard update... I like it quite a bit. It's already been talked about ad nauseam, so I won't go into details on what it contains. A word to the wise though: don't try the Windows Live Messenger feature if you don't have a USB keyboard or that new texting attachment. Using the on-screen keyboard leaves much to be desired in a real-time conversation.
What I'm not happy with, however, is the new Double Dragon game on Xbox Live Arcade. Apparently, it's a port of the original arcade game, and not the version from the NES. Very disappointing. Oh well, I was still planning on buying a Wii at some point anyways.