Gruber has been more accepting of the new iOS App Store rules than I am, but I like his latest post on the subject. New information to me: there’s a limit of 3,500 items in the in-app purchase catalog for any iOS app. As he notes, this has obvious implications for Amazon. It also occurred to me last week that the 30% Apple cut wouldn’t work terribly well for the oft-rumored NFC implementation. If Apple wants us to use iPhones as payment devices everywhere, they’re not going to be taking 30% of all transactions made via the iPhone. So I keep on thinking there’s more to the picture than we’ve seen so far. I’ll say this: Apple continues to be annoyingly opaque.