I have a 2002 iMac G4 700MHz that's still chugging along. I upgraded the RAM to 1GB (max), and got a LaCie 160GB external awhile ago. I plan to replace it with the new Intel Mac tower machines when they come out this year...maybe with the 30" cinema display...
I also have a Dell Dimension P4 3.4GHz that's also a great machine.
Mac OS is much easier to maintain than Windows but I like IE better than all the Mac browsers -- websites just work.
For the Mac side I love iTunes (know it's available for Windows too) and iPhoto...
2006 330i, SP, PP, fold down rear seats, sparkling graphite, black leather, metallic trim.