Personally, I got sick of Windows XP crashing on me every 2-3 hrs of multi-tasking 5 different apps: 15-tab FireFox, iTunes, Photoshop, Word, eBook Reader. Then I thought... hmm... people seem to be okay with Mac so far... no compliant regarding multi-tasking except all the apps run a bit slow due to the OS itself and slow CPU. I got a PowerBook 17" 1.33Ghz 1GB RAM. Yes.. it's slow compared to my Windows... but it didn't crash on me like hell. So, I could live with that. I only have the stock 5400-rpm HDD... What's your reason for switching over?