PowerSkin is showing off their silicone cases at the CTIA this week, and if you aren’t aware, these are a hot little item.  They can essentially double your battery life by using a built-in backup battery inside the case.  A press release from PowerSkin describes the cases as:

Outfitted with impact-resistant silicone rubber, PowerSkin cases are lightweight, flexible and feature a non-slip grip for ultimate protection.  They are also 100% recycled (aside from the battery and internal components.) XPAL Powered battery technology extends talk time anywhere from 4.5 to 8 hours, depending on the phone, providing a convenient and compact source of power.  PowerSkin cases are designed to be a go-to, go-anywhere, go on-and-on power source.

These cases will run about USD$50-$60, depending on the phone.  You can head over to PowerSkin’s website and order yourself one of these cases!