Popular iPod case manufacturer iSkin is introducing a new case accessory specifically designed for the new Apple iPhone 3G. It is called the iSkin revo2 and pricing is around $40.

The iSkin revo2 encases the iPhone 3G in a protective silicone material, according to iSkin. This is designed to protect your mobile from dings and dirt. Joining this layer of protection is antimicrobial product protection as well as a face shield which is transparent and detachable.

Taking a queue from the marketing folks for Apple’s new MacBook Air, Timbuk2 has announced the Steve Sleeve. The thin case designed specifically for the notebook resembles the manila envelope that Apple uses in their commercials and that Steve Jobs used to originally present the Macbook Air.

Timbuk2 assures us that when the Steve Sleeve actually starts shipping in March we’ll find that it’s much tougher than a standard manila enveloper, however. It has a soft low-pile fleece lining (from recycle-ready poly no less), an exterior made from the same stuff as mountaineering jackets, ultrasonic welds on the seems and brushed (recyclable) aluminum buttons.

BlackBerry 8800 series device owners looking for a way to protect their CrackBerry investment should take note of a new case from Otter Products. The OtterBox 1933, priced at around $50, is designed to give your BlackBerry an extra level of protection.

The OtterBox 1933 offers what Otter Products says is three layers of protection. These layers include a clear membrane to protect the screen and keyboard against scratches and a polycarbonate shell and silicone skin to protect against bumps and shock. The combined case offers usability of the BlackBerry’s trackball and headset speaker.