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Apple today announced that the iTunes App Store now features over 100,000 applications for the iPhone and iPod touch. App Store users have downloaded over 2 billion applications. While Apple is obviously celebrating this as a success of its developer program, AppsFire reminds us that only a very small number of these apps are hits. According to AppsFire, the majority of apps sits in the App Store's long tail, where 80% of the apps barely see any active installs.

The iPhone App Store is a blessing and a curse. It's one of the best things about the mobile platform, but it's so popular that finding great new apps to download can be a real challenge. Where there's a monetizable pain-point, services will flower! Enter a variety of new iPhone app recommendation services that aim to point you toward your next download and pocket the affiliate fees for paid apps.

Below we've posted a chart comparing the features of 5 new services for iPhone app discovery: Apple's own App Genius, a new social app discovery service called Chorus that launched to great press coverage this morning, a simple mobile sharing service called AppsFire, a remarkably similar service called Yappler and Appolicious, a website like Delicious for iPhone apps.