I got one of these Leather case for Sprint PPC-6800/Verizon VX6800/HTC Mogul/HTC Titan/HTC P4000 - Book Type (Black) for my HTC Mogul, and am pretty much satisfied with it.

A couple of cons:

1. It has clear plastic over the keyboard which greatly reduces the tactile feedback.
2. When an incoming call wakes up the phone it causes the buttons to unlock. Then when you press the case cover, the send/hang-up buttons get pressed causing the call to drop. I have to be VERY careful fishing the thing out of my pocket.

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Don't mess with old futs...age and treachery will always overcome youth and skill! B. S. and brilliance only come with age and experience!