Just a question: I have 4 GB and running Windows 7 RC with a Crucial 64GB SSD. If I try to run two instances of World of Warcraft, I can't play more than 5 minutes without both instances crashing because of an *apparent* lack of RAM (that's why Win 7 tells me). In this case, I don't have a page file whatsoever.
Turning on a 4GB pagefile on a secondary HDD solves my problem. I can now happily dual-box without any problems (both characters in Dalaran on high-pop hours).
Is it the page file helping me? or something else? WoW doesn't take that much RAM (around 700mb, according to Win 7).