I'm a designer and I love my Mac, but I've got nothing against designers who use PCs. Use whatever you have access to, I say.

As for the iphone, it's neat, I don't need one, and most likely won't get one unless the price drops dramatically, which it won't. Apple always has its preset price points and they rarely drop prices, but rather fill the spot with beefier equipment.

On to my Kit for standing in line for the iphone...
Earplugs so I don't have to listen to the geek in line behind me prattle on about his latest set-up.
Deadfall with Twinkie bait so that I can take to place of the chump in front of me when he goes for the tastey morsels and winds up with his head stuck in my masterful trap.
Lysol because it's bound to get smelly with lots of people standing in line for days that close to one another.
Something to attract those hot little Apple groupies.

There has to be more... I'll keep thinking about it.