I was in between getting a 2 gb or 4 gb mba then ended up getting the 4 gb one... I dont consider myself a heavy user... Mostly outlook, quickbooks, safari or firefox, skype , msn messenger etc... Today I was cleaning up some images in photoshop cs5, no raw..just 5 MP jpgs..had couple of chrome windows open... Msn and skype was open... My free memory was 600 mb out of 4 gb... Photoshop was using like 750 mb's of mem.. So i thought i made the correct move by getting the 4gb one... But when run outlook and quickbooks under parallels.....whats gonna happen? Why do yu think these apps are using so much memory? When I clean boot... Only msn messenger and skype gets loaded on startup... Plus activity monitor... I have 3.10-3.20 gb's available... How bout u guys?