If you buy a new Intel mac be aware that the Adobe Creative Suite hasn't been ported to work with the Universal architecture yet so you'll see slower performance till that happens (currently Rosetta is used as a translator so non intel chip apps function on the intel based new macs).
Otherwise welcome, and be sure to go out and buy a two button mouse with a scroll wheel (ditch the one button crap mouse right away!) to ease your transition from windows.
