I'm now using my 1.67GHz 15" PowerBook for work, around 10-12 hours a day and it's clogging up, bogging down and generally getting not coping – but I know I can't upgrade to a MBP and I don't think a MB would do enough. Plus I have compatibility concerns with my PowerPC software. The 'Book is running 1.5GB of RAM, Tiger, an 80GB 5400RPM drive with about 20GB free at any one time, plus constantly running Quark 6.5, Photoshop CS, iTunes, Adium, Acrobat 7, Shrook, Safari, Firefox, Word, Mail and an also being worked over by an External 40GB F/W drive. Should I up the RAM, improve HDD speed and size, look to buy a MacBook? What else is there I can do? I could also look at a desktop. An iMac might be the way to go for some more oomph as I could possibly keep the PB for portability when necessary. The PowerBook has a big chunk out of one side where it got dropped so it's not in warranty and looks a bit unsightly to sell. Edit: Oh yeah, plus the screen keeps doing the random dimming thing. Very annoying.