Doing my second run through of the Starcraft 2 Campaign and playing multiplayer with a newbie friend so we can both practice online matches. He's never played Starcraft before, mainly being an FPSer, and I, being someone who's been playing Blizzard RTS's since Warcraft 1, decided to help him out. I will admit, I'm not very good, being too reliant on high-priced units, while he spams Marines and Marauders, it's a learning experience for the both of us.
Also, Team Fortress 2, which I'll probably be playing until the end of all days.