But I have 3 PC's as well.
I've been running Windows 7 RC1 on an older computer, with a Socket 939 motherboard.
It works great as a multimedia computer.
I also have a "Beast PC," with a Phenom Quad Core CPU, etc. The Best runs Windows Vista Home Premium 64.
The network is served by a new Barebones build running Windows Home Server.
I will most likely run Windows 7 on a new computer that I'll build before October.
I might install Windows 7 on my Beast PC... but I hesitate to do so because it's still under warranty.
The fact is that I love to build PCs. That's one thing I can't do in the Macintosh world!
I've pretty much decided that any new computer builds will run Windows 7.
I have a couple legal copies of Windows XP, but I just can't see installing an old OS on a new computer!