I am particularly fond of the Defender Otterbox cases. I think they bridge the gap between slimline and protection very well.
Of course, that's one of the things I"m so enamored with the IPHONE over.
No other device is as well supported. There are tons of cases for the IPHONE and most of them look damn good to boot!
My Samsung Epic has like 3 cases and only one of those is serviceable, but even it doesn't look that great.