For as incredible and game changing and amazing as the Apple app platform is, there’s no getting around that navigation for the thing just sucks. You can generally find the top ten in a number of categories, and some “featured” apps that seem sort of arbitraty, but after that things fall off pretty rapidly. You can’t, for instance, go to the Angry Birds app and then find other apps that are similar or were bought by the same customers the way you might at Amazon.
That may change. Apple has acquired a company called Chomp, which is a search startup.

From Bloomberg:

Chomp’s software lets people search through the hundreds of thousands of downloadable applications available for Apple’s iPad and iPhone, as well as gadgets running Google Inc.’s Android operating system. Users can enter queries such as “tip calculator” or “kids games” to get different options of apps that fit those descriptions.