I'm moving to a much nicer city in a couple of weeks, unfortunately at the expense of space...I'm losing an extra bedroom that I had previously used for my computer/guitar/whatever stuff. 

@MB: 
Ah :/ there seems to no way for it to get into the dining or living space.

All I can think of is using the end table in your bedroom and somehow get the computer in there or find a corner in your living room where it could go.

Thats all I can think of really. Try doing a few draw ups in paint of something and working it out like that :)

Hope you manage to make everything fit!

Hard to say with out pictures to see the room arrangement to be honest. As you said, hooking it up to the TV is probably your best option if you don't have any space, but if you can find the space a little corner desk would be a good way to go. It just has to be big enough to fit a keyboard and another 6-12 inches for mouse space. Stuff like this:

Gallery

I do have a huge walk-in closet that I could probably put a computer desk in...but there's no ventilation in there! Heh. 

I used to use a walk in cupboard as a small computer room. As long as you keep the door open while you're using it, I wouldn't think that ventilation would be a problem. It certainly wasn't an issue for me. 

" @MB: I've seen this problem time and time again. In my experience it's usually best to just bite the bullet and shove it in to your living room set up and turn it into a HTPC with added functionality.

It'll work long term or as a more temporary solution until you can shuffle things around to make space for it.

"

I like Matty FTM'a approach. As for ventellation added, go vertigal in the walk in closet, and put in a corner shelf for a fan. hell, hang one from the ceiling if you are allowed, and the is already a lightsocket situated(iffy). I know this isn't likely possible with the cieling hung and maybe room for the shelf fan, but I have a small bladed fan with light in the den that might be perfect for the app.

Also, you might consider the possibility of say your monitor or printer on a glass wall mount shelf (they make a very strong one) and see if that in turn buys you space.

" Hard to say with out pictures to see the room arrangement to be honest. As you said, hooking it up to the TV is probably your best option if you don't have any space, but if you can find the space a little corner desk would be a good way to go. It just has to be big enough to fit a keyboard and another 6-12 inches for mouse space. Stuff like this:

Gallery

I couldn't find any photos, but maybe look a big computer desk that could also double as a place to keep your TV/stuff as well?

"

"

 

I like Matty FTM'a approach. As for ventellation added, go vertigal in the walk in closet, and put in a corner shelf for a fan. hell, hang one from the ceiling if you are allowed, and the is already a lightsocket situated(iffy). I know this isn't likely possible with the cieling hung and maybe room for the shelf fan, but I have a small bladed fan with light in the den that might be perfect for the app.

 

Also, you might consider the possibility of say your monitor or printer on a glass wall mount shelf (they make a very strong one) and see if that in turn buys you space.

"

Try a  bunk bed if that’s an option? my girlfriend had one and she was able to store a ton of crap under it. Until she moved all her crap in to my place...crap.

Switch it out with this laptop:

edit:

Aside from some games having unreadable text at distance (Dragon Age on my 37" at anything more than a meter distance) hooking your PC up to a TV and getting a proper side-by-side of, say, Bad Company 2, or, more distinctly, Call of Duty MW2 on an X360 / PS3 versus the PC will offer the most telling difference between the two platforms. When you only have to manage a 1080p max resolution the options to crank-up the anti-aliasing, anisotropic filtering and high-flash post processing reach ever-skyward.

Everything just plays better on the PC, and if you're not convinced the answer is usually 'Just add GeForce' or 'make sure the Bluetooth antenna is closer to your input peripherals than your WiFi adapter' (something you'll need if your PC becomes a permanent living room fixture). Backwards compatibility is perhaps the biggest gain on the PC, an advantage overlooked when staring down all the glitter.
The World is Not Enough and Turok 3 run like a dog on the N64? Oh well~.
Doom 3 not run so well on your Windows XP box when it first came out? Try it now. Banging.

Cheers.

What about using the corner desk option in the bedroom and wall mounting the 27" samsung, then if you add a TV Tuner card to the PC it becomes a home theatre PC too so it serves more than 1 purpose, while wall mounting the screen helps reduce the impact on the space requirements.

Take a sledgehammer...make space, thats how real men do it!

Any thoughts on putting the PC's contents into a Media Center case and using the TV as monitor in combo with a wireless mouse and keyboard?  I've done so before and it was a fine solution.