Developed as a cheaper rival to OtterBox's Defender, iFrogz's BullFrog for iPhone 4 ($35) is yet another heavy-duty case for securing your device against drops and the elements. It's composed of two layers: a hard plastic slider-style shell, and a soft rubber outer sleeve. When it's fully assembled, the iPhone 4 is pretty well-protected; there are flaps covering the Dock Connector and headphone ports, rubber over the Sleep/Wake and volume buttons,…
