I'll be playing The Orange Box, Sonic the Hedgehog and Sonic the Hedgehog 2. I didn't play through Half-Life 2 or Episode 1 when I got The Orange Box so I'll be going through them to milk some achievements as well as replaying a great game. Pretty much the same deal with Sonic, I downloaded them both from XBLA a couple of months ago but never got around to finish either of them.