Just played with the paging on my Tablet, prior to upgrading it to Vista. It made quite a difference (had installed 2Gb Ram in that when I got it, and never bothered to check - set to 768Mb or something).
Can't say the effect on Vista, but it does "seem" much quicker than when it was running XP with sub-optimal paging ! Which is a bit of a surprise really, particuarly as I am running Aero, was expecting it to be like treacle.