Gizmodo have an interesting article on the price of iPhone applications, how they have dragged the consumer's expectation of app pricing down, and how this might not be a good idea in the future.
I can certainly say that I won't be expecting to make much money out of Bleep. Its taken longer than expected to develop, and I don't think I'm going to sell lots of copies. How anyone can make a business out of developing these things is beyond me... I suppose we'll see :)