iTunes 8 clearly displayed all app categories, such as games, finance, entertainment, and what have you, on the left-hand side of the screen. iTunes 9, however, hides all of these categories under a tiny arrow within the top navigation bar. An arrow that doesn’t appear unless hovered over.
I didn’t notice, because I don’t browse for apps, but hiding the categories that way is indeed a little weird. And I’ll never understand why customers are expected to care about a list of the top-grossing apps.