The Contour iSee for iPod Touch 2G is a polycarbonate plastic case. It's crystal clear, lightweight, and extremely durable.
"At 0.8 oz, the iSee will neither be seen nor felt, but it will protect. Oh, will it protect. Made of crystal clear polycarbonate plastic, the iSee will prevent all sorts of dings and scratches but never draw attention away from the touch. So enjoy rock solid protection along with full access to all of the controls because the iSee is the best case you'll never know is there."The highlighted features for the iSee iPod touch case includes the Crystal clear polycarbonate hard shell, full access to all controls, easy snap together assembly, and the ultra lightweight (only 0.8 oz). It's currently available for $29.95 on contourcase.com.
Check out also the unboxing/review video for the Contour iSee case for iPod touch 2G: