Griffin has recently announced a new iPod touch case, FlexGrip, which is a silicon rubber case. It's a dual-color case: the front is black, and the back is covered with grip-molded grey dots with varying size. Currently, black and grey are the only color combination that is available for the FlexGrip iPod touch case, while the clear + black and red + black version is forthcoming.
The Griffin FlexGrip iPod touch case also comes with a screen protector that covers the entire front screen except for the Home button. This case is highly accessory-compatible. It works with everything that you might want to plug in to your iPod touch. The price for the FlexGrip is currently $14.99 which is really reasonable!