Well, I never want to discourage an entrepreneur, but I do like what you did with that. These people that make Twitter and iPhone businesses should realize that, sooner or later you will need to 'pay tribute to Big Paulie'. Or Big Paulie may just decide he wants your business. No sense complaining about it, just know that going in.

Again if you want to make iPhone apps, I think you should. Just stick to Apple's rules while you do it.

I think we should think of it like doing business in a totalitarian state. Expect them to play nice so long as it suits them, play it safe and by the rules, but don't be surprised if they ever send the police to close your shop.