It really depends on what's going on but it's either the living room or the bedroom.
The living room is where my little computer office area is and where the comfy recliner and big screen are.
The bedroom is where the comfy bed with tons of pillows and the DVD player are.
So if I have a lot of computer crap to do or just feel like reading, it's all about living room. If I want to watch movies, play Gamecube, or need to read while being propped up with tons of comfy pillows, it's all about the bedroom.