Saw via slashdot that there's a Windows Vista/7 SMB2.0 Remote B.S.O.D.
"Oops"
Looks like you can send malformed SMB headers at a fully patched Vista/Windows 7 server and "poof", BSOD. I haven't tested this of course, but something to be aware of, I'm sure a patch for this will be coming out RSN.
The saving grace is that SMB2 is probably not going to be a) enabled on a server connected to the net or b) allowed into a corporate LAN from the outside. Still a danger though...