Space constraints or not, the 4GB limitation is annoying. I'm using a two month old 13" MBA, which will go to replace the wife's 2007 white MacBook once I get t

Space constraints or not, the 4GB limitation is annoying. I'm using a two month old 13" MBA, which will go to replace the wife's 2007 white MacBook once I get to the Apple Store, and the dashed hope of getting 8GB has dampened my enthusiasm. But not cancelled it completely ;)