Not, strictly speaking, a hardware issue, but this sub-forum is still a more appropriate place for it than the "games" sub-forum. It is also more appropriate than the "off-topic" sub-forum, because we are mostly interested in Windows from the perspective of gaming... This also applies to threads about emulation, all of which should go in here too. (Threads for purely non-gaming applications, on the other hand, should go in the "off-topic" area).
So yeah, I've had this idea for my new PC, to get three 1TB hard drives (which are ridiculously cheap these days) and install the three latest Microsoft OSes in them, one per hard drive: Windows XP, Vista and 7. This is because there are still tons of emulators and other applications which do not yet have Vista (let alone Windows 7) versions, and some of them perhaps never will.
In addition, I think I might also get a fourth hard drive down the road and install Max OS X on it. I've been using OS X exclusively for the past year and a half, ever since I bought a MacBook Air, and I don't think I could go back to Windows for pure non-gaming applications. Does anyone know if it's possible to install OS X on a PC? I know for a fact that installing Windows on a Mac is possible, ever since Apple switched to Intels, so it would make sense that the reverse is also possible.
So I'll do some research and report back with the results. If you know your shit on this subject don't hesitate to help me out.