While I'm on the subject of cases I have an oddity to cover: The for iPhone and iPod Touch.

This product is definitely not pocket friendly and is intended for people who have large pockets (in both the financial and capacity senses) and need lots of run time for their iPhone, such as die-hard gamers. Indeed, battery life extension is a must if you're on a long plane flight and keeping Angry Birds running is all that stands between you and running amok at 40,000 feet.

Compatible with the iPhone 3GS and 3G, iPhone 4 and 4S, iPod Touch 2nd, 3rd and 4th generations, the oversized case (6.3 by 2.7 by 0.75 inches and weighing in at 4.16 ounces) contains a rechargeable 2050mAh lithium polymer battery that delivers an additional talk time of 10 minutes and a standby time of an extra 100 hours. You can switch off the battery until it's needed.

The PowerSkin Gaming Case GP2100 is bulky and kind of ugly and, although it gets the job done, the case is too spendy and so only gets a Gearhead rating of 2.5 out of 5.

If you'd rather have an elegant iPhone case, you might consider the by CM4, which "unites your desire to simplify life and protect your iPhone."