Can anyone give me an idea of the significance of an upgrade from 2mb to 4mb on a new MBP? Essentially, I'm wondering if I'll even notice a difference for what I'm planning on using it for. Basically, I'll be using my MBP for work which mainly involves office programs plus I'll be doing some photo editing (no video) and running a virtual machine using VMWare Fusion (With Vista Basic). I'd like to be able to run multiple programs at once without taking too big of a performance hit. Any information would be greatly appreciated. Thanks!