Less than a year after introducing its App Store for iPhone and iPod touch, Apple announced in early June that the virtual storefront now boasts more than 50,000 mobile applications. 
Of course, that number doesn't include the many applications rejected or removed along the way--while the iPhone SDK outlines approval policies tied to basic reliability testing and other analysis, Apple can also turn down applications that duplicate existing iTunes functionality or offer "limited utility." However, the complete scope of the App Store submission process is known only to Apple, and as the list of verboten applications continues to grow, so too does developer confusion and frustration over why some iPhone apps make the grade and others don't. Click here for a slideshow of some of the most notable App Store rejections and controversies. -Jason
