I'm not a part of that "Mac" market that they targeted - I have a gaming PC, a PS2 and a Mac (it's my laptop, an iBook, that is mostly used as my work machine), but I'm really happy about Blizzard's decision to make WoW Mac friendly.
I have mostly played on my PC, but I gave it a try on my iBook this morning and it was very cool. My iBook is not a performance machine, but it more than meets the required specs, and I'm thrilled because now I can take an MMO on the road!
Before now, the only MMO available to mac users was EQ, and you had to play on a Mac-only server, and most of the expansions were not available. This didn't interest me at all, and I know that there was a lot of complaining about SoE's decision to make a Mac only server.
Anyway - great job Blizzard and Thank you!