Belkin has more than one iPhone 4 case in the works. The one here is the Grip vue, which overlays the phone with see-through sheen, plus the backing is made out of a grippy material. Belkin claims the casing is durable and impact resistant.
iSkin makes a variety of different iPhone 4 cases. The ones seen here are the Solo and the Enigma. The Solo has a high-gloss finish and is available in an array of colors, while the Enigma is made with a leather exterior and a microfiber lining.