Well, the price of memory is so low that I can't resist the urge to upgrade.  Of course, I've never used all of the 2gig I had originally but I noticed a little boost in how snappy my system was when I bumped it up to 3 gig.  So...I figured I'd give 6gig a shot.  With 6gig I should have so much memory that a large portion of my disk activity will be cached.  To get there I picked up a pair of 2gig sticks. I'm not sure how much benefit I'll get out of 6gig after vista's overhead is factored in but I'm guessing it will seem at least a little snappier. Also, I won't have to buy any more RAM any time soon :D