Just recently Facebook announced that it will soon release a new App Center and is currently recruiting developers to submit info about their apps for review. Each app in the new center will feature its own unique detail page that can reviewed before considering the app.
I find it interesting that an app can be a HTML5 Canvas page, which is considered the up and coming new platform for for building apps. For example Mozilla released Browser Quest to showcase the power of canvas, and is a multi-player game that can be played directly from your browser, with no downloads.
Find more about the Facebook App Canter here!