Received my Apple iPhone 4 Bumpers (Black) from the iPhone 4 Case Program today. It was shipped on the 20th August 2010 and it took about 5 days to reach me. The Apple iPhone 4 Bumper is retailing for US$29.
I can’t really find anything special about the bumper besides the metallic material used for the volume controls and power button. It does not protect the back which is major disadvantage.