If you need your iPhone to go the distance without a recharge, Mophie's ($100) could be your saving grace. The battery case boasts Mophie's largest battery pack—2000mAh—which should more than double your phone's battery life. The Juice Pack Plus also provides a comfortable, ergonomic design and its dual-injected, hardshell case with shock-resistent, rubberized band delivers protection.

Pad and Quill's ($40 with camera portal, $35 without) lays down the charm with its travel-diary design and hand-crafted wood frame. The folio-style case features black, faux-leather binding, a wrap-around strap to keep your phone safe and snug, and a classic red bookmark to complete the illusion.

Pinlo bills the ($26) as the world's thinnest iPhone 4 case. At just 0.35mm thick, this could be a credible claim. Constructed with precision machinery and plastic-injection technology, this 3.5-gram plastic case should be good for anyone who can't tolerate the extra bulk of standard cases.