I have the 360 in my entertainment center. Its earned its place. It streams music and some video to my hdtv over wireless. Emphasis on SOME. Codec support for 360 streaming video is still kinda argh. It also plays cds, is my upscaling dvd player. I then have a very small form factor pc in the entertainment center that streams video to the hdtv exclusively and I use sometimes for web browsing, but thats pretty much it. I also have a dreamcast hooked up but im considering packing it away since I dont play it much anymore.
I keep the 360 games and the Xbox games that ARE backwards compatible inside a shelf in the e-center. I have a 185 wood/glass dvd case for my dvds but thats overflowing so ill have to buy a matching one to start filling again.
In my room I have a dual LCD setup with one going to my main PC which I use for demanding games, and pretty much every thing else related to encoding, decoding, and work related. The other lcd is run to a TV tuner hidden under the desk that has a universal cable that splits to the Gamecube and PSTwo. Most of my Cube and PS2 games are time consuming so I like to pick at them over the course of months, and having it at my desk is the easiest. I have all of my PS2/Gamecube/PSP/DS/GBA games in a cabinet so no one can see how many I own. I wish I had time to actually play them all.
I have a work laptop that I sometimes use to PLAY CHUZZLE DELUXE, but gaming on its pretty off-limits, but I just got a new laptop strictly for home use that runs WoW playable...at least for PVE lol, and runs the Warhammer RTS series from relic pretty nicely. I use it for DVD viewing from time to time, but its mostly for when im in the living room watching tv and wanna bum around the internet or tinker with a game.
I also have a GBA, DS, and PSP that sorta float around the house. I usually only play these while watching TV because thats really the best time for portable gaming.
I really try to pack gaming into all the moments most people dont consider to play games, cause I like to have time to spend at least half my weekend away from my house and most of my evening after work away from my house. Sundays are usually GAME ON tho cause wtf lazy Sunday.