I have 4 GB of RAM installed in my 2011 MBP(stock). Free 50MB Wired 958MB Active 2.05GB Inactive 988MB Used 3.95GB VM Size 203.14GB Page ins 6.14GB Page outs 4.57GB Swap used 2.74GB All I use this for is Safari, iMessage Beta, iCal, iTunes, MS Office/iWork, and Quicktime. Lots of flash with safari(YouTube and such). Also I am using it in clamshell mode with Apple Keyboard and Magic Mouse with 20" Acer display. Every now and then if I wanna webcam I'll have both screens running so I can use the built in webcam, but then I close the screen when not in use. I thought 4GB of RAM should do it, but do I need more? Thanks!