I've been noticing some choppiness with my 1.5GHz / 512MB Powerbook lately when I have a lot of apps open. I don't have anything "fancy" open -- nothing like Photoshop or anything -- but I'll have Mail, iCal, iTunes, Firefox, Preview, Word, Quicksilver, Newsfire (newsreader), and Adium all open. For a few weeks now, I've been running Activity Viewer's memory pie chart in my dock. On a typical day, I have 30-50% of the pie colored yellow, meaning that much memory is "active." About 20% is red ("wired"), 20-25% is blue ("inactive") and the rest -- it varies from about 5% to an almost invisible sliver -- is green for "free." I've downloaded "Do I Need More Memory" and it typically says I need about 15MB more memory. (Sidenote: I don't know whether to trust this program, because someone on Versiontracker has written a long rant criticizing how the program works, and some of his / her criticisms seem right on.) So, perhaps on the basis of the memory pie chart in my dock, do you think I "need" more memory? I have 2x 256 MB chips currently, so if I do upgrade, I'd need to probably just sell those and upgrade to 1 gig (right?). Like any other poor starving college student, I don't want to spend the money unless I know I'll really get something out of it. I guess my question is, will I see an improvement in performance? Do you only see improvements if you're a Photoshop or FCP junkie, or would you also see it in "everyday" tasks? For anyone who did upgrade to a gig of memory: do you regret it, or was it money well spent? Sorry to be the 99999th person to post about RAM, and thank you in advance!