The entire situation that went down with Camera+ probably ranks near the top as one of the weirdest events of 2010 for iPhone owners. This rings especially true if you happened to own or were considering purchasing Camera+ at the time of its banishment.
Essentially the story went like this, tap tap tap -- the app's developer -- snuck in a hidden method to enable the volume buttons to function as physical shutter buttons for the iPhone's camera. Apple didn't like this, and as expected, removed all traces of Camera + from the App Store...