It's a ton of B-sides from a big period of time. Rivers (Cuomo) has been mostly in charge of picking which songs are gonna be on that...I played on a lot of the songs. Some of the songs were around before I was in the band (since 2001). There's so many cool things that we've recorded for records that never made the (albums), I think they had to get out there. Finally it's going to happen.
The band will also be contributing a new song to the soundtrack to the Shrek Forever After film which is the second contribution from the group to the computer animated series. Check out the full report via Billboard.