Just a quick note... the Mac App Store is live and I think it will be good for photographers. It's only been up a little over 24 hours and I've already seen several good photo apps that I have not seen before, either because they didn't exist before or (more likely) because finding them otherwise is like finding a needle in a haystack. Also note that Aperture is only $79 from the App Store vs. $199 through other channels. Keep your eyes on the store for even more good apps to come and better prices on existing apps — and if you're not using a Mac, what are you waiting for?