MxPx has announced plans to release, Let's Rock, a collection of b-sides and rarities due out in October via SideOneDummy. The band had this to say:

This release is full of previously unreleased songs, re recorded b sides and acoustic demo's! You'll be able to hear a songs evolution from demo to finished product when you listen to the fan favorite "Family Affair" which began it's musical life as "Sweet Sweet Thing." Or another favorite that has been re recorded is the upbeat "You Walk I Run" that was featured on the Japan and Australian "Responsibility" single release! Stay tuned for more on this fast upcoming release!,

The disc follows the band's last studio full length, Panic.

More...