I know I am a noob here, but I used the search function and didn't find anything. Sorry if it has been covered elsewhere. My friend and I have identical Macbook Pro 13" (the base model with 2 GB RAM) but mine has 10.6 and his 10.5. While running Garageband, I often get a lack of memory message if I have other applications open, while he has only on rare occasions seen the message (with similar apps open). We checked the memory usage in Activity Monitor and he uses much less memory. In fact the "wired" red slice of pie is exactly half of mine (me at 450 MB and him at 225 MB). I have even gone to the bother of turning off things like screensaver, dashboard, etc. but he still uses less memory. Even after nearly a week's usage, his inactive memory is around 200 MB while mine is up around 500 MB. Is this a function of 10.6 vs 10.5? Or is there something I missed? Thanks, Phil.