The wonderfully cameo-filled Team Indie platformer has been launched for your Windows and Mac machines and is available both on Steam and as a DRM-free download on the Brightside Games site.
If you have to know, Team Indie is a vibrant, smart and cartoony platformer you'll get to --uniquely-- play in single-player co-op mode. You'll thus get to use the abilities of a selection of famous indie characters from Captain Video and Clunk to Super Crate Box Guy and Dustgirl in order to make runs through each level that will clear the way for your main character; a cute cat that's been transported to a video gaming universe.
Confused? Good. Just have a look at the trailer posted above and all will become clear. Oh, and do know that this is a delightful thing to play with.