I just recently relocated 2 PCs into an adjacent unfinished space above my garage last week because I was tired of the noise and I don't have the luxury of a separate vocal booth anymore in my home recording space. My P4 PC is older and the hard drives and fans make a lot of noise when running. The other Core 2 Duo PC is pretty silent, but I decided to kick that one out of the room anyway.
I simply ordered a ton of extension cables from monoprice.com and cut a hole in the wall and now my space is virtually silent.
I'll try to add some pics of the project later when I am on my laptop that contains them.