The Apple App Store police is the one known to reject application in apple products for some violations like duplicating Apple functionality. Jobs and his cavalry is now on the move to slash apps that is too widely and those that creates its own desktop.Great application which was earlier approved by App Store police, MyFrame - from Groundhog Software, received a notice that in the near future, their existence in the market would be no longer.
More details about these, on the link below.
Link: Steve Jobs beheads iPad apps for acting like desktops â