Image courtesy of Tapbots.com
Convertbot offers a time conversion feature and the icon that represents it, which has been the same in all versions of Convertbot since it was initially released, was flagged by Apple:
Convertbot 1.4 was rejected because our icon for Time is too similar to one of Apple's default resource icons for History/Recent. They say users might get confused that our Time category might mean History or Recent. Now I might be able to understand if this happened when we first submitted Convertbot, but there have been multiple releases already so why is this a show-stopper now?
In order for the update to be approved, the icon must be re-designed. However, Apple has not provided any guidelines on what will be an acceptable re-design.
Convertbot costs $.99 and can be found here (link opens iTunes).