Looks like the Gorillaz will be teaming up with Madonna for the opening act at the Grammy's. Other nominees to look for are Jay-Z/Linkin Park for best Rap/Sung collaboration and the hard rock category has:
System of a Down: BYOB
NIN: Hand that Feeds
Audioslave: Doesn't Remind Me

and the metal category has:
Mudvayne
Slipknot
Ministry
and Rammstein

overall a pretty good year for music, a new album from NIN, new album from Mars Volta, and two new albums from SOAD! :)

The Oscar nominees are also listed here...