I'm quite happy with my decision to switch, but there are two problems that I hope could be resolved. 1) iMovie5 crashes everytime I export a movie to avi format (they are about 12 minutes long, 2GB, in cinepak codec). I used the hardware test and found no problems with my hardware. I also have the updated version of iMovie5 2) I was running matlab to do some analysis (Particle Imaging Velocimetry), the computer slowed down significantly after a while. I checked the ram and all 1.5GB is used up. I quitted the program, and most other programs, and about 500MB of RAM is still missing(the Activity monitor showed only about 1GB of free RAM). Is there anyway I can reclaim the RAM without a restart? My powermac arrived two weeks ago.. It's a Duel 2.0 with 1.5GB ram (512 factory RAM, 1.0 from Crucial), and 9800XT Any help will be appreciated.