I am again trying Aperture since the recent posting of the fully functional trial for Aperture version 1.5. So far so good. I imported about 10,000 photos and am working trough them much more quickly than I did when I was using iView Media Pro 3. I really like the full screen version.
After reading reviews I was almost ready to make the commitment to Aperture anyway but having the trial version is helping me see if it will really work in my situation before plunking down the 300 clams for the full version.
More on this as I use it.
FYI, I am running Aperture on my MacBook Pro with 2GB of RAM but will get it installed on the G5 as well; just as soon as that video project is finished!