Video/Audio editing. Overall ease of use both OS and otherwise is second to none. Period.
Apple is generally used in a studio or development or research lab/office as opposed to in a home.
If I could afford it I would keep both a PowerPC and a PC.
I have had the pleasure of using Apple computers before in both a school, lab, and home environment and it was great while I had a chance to toy with them.
All that quality is only marred by a lack of games and the overal price of a system that can easily be double that of a PC of comparable raw performance.
However quality is just awesome. If all that cool stuff Apple made came to the PC they would make a killing.
Lots are coming too. Not just the LCDs but also wireless iPod and music streaming to any stereo/Mac system/PC in the house with wireless and some other cool stuff.