The Lost Hobo King DLC is now available through Xbox Live Arcade for 400 points and Playstation Network for $4.99. I'll let THQ do the talking from here:

"In The Lost Hobo King, Charlie travels to the kingdom of Camelfoot to help his hobo friend Levi with an important family matter. Levi’s uncle Rufus, heir to the throne, may only take his rightful place if the lost crown can be found. To recover the fragmented crown, Charlie must use his unique talents to overcome several tests of valor left by the ancient hobo mystics. It is only then that the ancient crown can be re-forged, Rufus crowned, and the fractured hobo people united under one sardine can."

If you haven't played Stacking yet, you owe it to yourself to read our review .