The ska/punk juggernaut A Billion Ernies is coming to the Rock Band Network. The two songs, "Existentialist's Apprentice" and "Reach For The Skies" are from the most recent album "Dumpster Generation" which can be downloaded FOR FREE from http://communityrecords.org (click the link for "free music" on the left).
You can also stream both songs on their MySpace page
Their website is http://www.abewobblies.org/
I've got even more amazing ska/punk lined up. Rock Band Network is the best thing that's ever happened.