I was skimming the Bill Gates PDC keynotes video and saw an extremely cool Vista feature.
You can actually plug in USB thumb drives and let Windows (via a program called SuperFetch) use them as if they are physical ram upgrades. So if your system has 512 megs of ram and you need an extra 512megs, just plug in your 512meg flash drive and BAM! You got it! (I'm sure its not as fast as real ram, but it has to be faster than writing to disk).
/me claps