I threatened to make this switch months ago and well -- I finally did it 2 weeks ago. I am now 100% on the Duel 2 GHz Power/PC G5 with 1.5 GB DDR SRAM.
With the first 2 weeks of interface transition idiocy behind me, the switch in retrospect was relatively painless. My biggest problem so far has been re-learning keyboard shortcuts for certain things. My second biggest problem is that Rhapsody doesn't work on teh mac and I used to like to use that service a lot.
Much thanks to Chad for helping me through this transition!