Sure – you might think all you have to do to have a hit iPhone app is make some kind of fart noise or boob jiggling application, but there is (at least sometimes) more to it than that. A little market research might be in order as well.
This slideshow from Pinch Media will give you an idea of the trends that have been occurring on the iPhone and iPod touch. Take it for what you will – if you feel like you’ve built the next great fart app – give it a shot.
It seems to be working for some people.