I have seen lots of different cases for the iPhone over the years. Typically, they offer protection only for your device and nothing like an extra speaker. A company called iMainGo has unveiled a new case that protects your iPhone and has an external speaker for more sound.
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The case will fit more than the iPhone with support for the iPod nano, touch, and other MP3 players. The speaker connects to a PMP via a 3.5mm headphone connector. The player can be controlled without having to open the case.
Power comes from four AAA batteries and the case has a removable carry strap. It measures 5.7" x 3.8" x 2.4" and sells for $39.95. You can pick one up right now.