OtterBox makes some very robust cases to protect your smartphone and offers the cases for a bunch of different models. The company has some cases like its Defender series that are bulky and protect from dust and water in addition to drops and bumps. The company also offers a line of cases in the Commuter series that are not as bulky but don't offer protection for water.
OtterBox has announced that the Commuter series is now available for a couple of the popular HTC Android smartphones. The Commuter series cases now offer protection for the HTC EVO and the HTC Droid Incredible. The Evo case sells for $34.95 and the Droid case is out of stock right now so no price is offered. I would assume the Droid case to cost the same as the EVO case does.
The cases offer multiple layers of protection with soft silicone and plugs to keep dust out of the ports. The cases allow access to all of the controls on the devices and the Commuter series ship with a screen protector to keep scratches off the screen. The cases are only offered in black and can be ordered right now. Commuter cases have a soft silicon sleeve that is enclosed in a molded polycarbonate shell.