Make sure to install TweakUI so you can move various system folders (my documents, desktop, possibly program files) off the Windows no fly zone and into the safe zone. Makes it even easier to get back up and running after Windoze reinstalls.
Because Windoze needs semi-frequent reinstalls to fix it after it eats itself. Just part of regular system maintenance.
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Even better is to create a disk clone of the Windows partition just after you install it and your base programs, if you have a few gigs on the other partition you want to devote to this. Don't buy any crappy Symantec products for this. Probably a better tool on that site Sivran linked (and some not so good ones, so make sure to do your testing before you get too far along).
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Dunno that I'd want to have to juggle space between apps and games, personally. That's a tradeoff I'm willing to make.
