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Mplayit’s Facebook-based directory of iPhone and mobile apps includes all 100,000 plus iPhone apps and a few for other platforms, as well. Applications have a dedicated page displaying videos of the app, a detailed description and reviews. You can also click to buy the app from Apple’s App Store.
There is also a "Pandora-like" feature that recommends apps based on the ones you have previously viewed. The site also displays in real-time what is happening in the app stores, such as Apple’s, to show users what apps are receiving the most downloads, reviews, etc.
Cool stuff.