If you do not like bulk and you like art, Gelaskins are a great substitute for a case for your new iPhone 4. Just slap on the study 3M vinyl sticker and download a matching background. It protects the front, sides (optional), and back completely.  I currently have the old 3G iPhone skin on mine temporarily to protect it and I can attest that this does solve the antennae dropping reception problem as well. Love this stuff,  but still waiting for them to release the Tokidoki iPhone 4 skins. I hope they do.

Go here to see all the designs!

http://cuteoverload.com/2010/06/21/settle-down/

Action Sqirrel

http://icanhascheezburger.com/2010/06/21/funny-pictures-video-action-squirrel/