Speck Products ToughSkin for iPhone 3G

Pros: Extremely tough rubberized material; included holster with rotating belt clip, locks into position for viewing stand; all controls accessible; Sleep/Wake button, Home Button, and volume controls all protected; hinged design allows you to dock iPhone while it's in the case.

Cons: Rugged design adds substantial bulk; somewhat pricey; no screen protection.
--Dan Moren