Maybe I've been watching too many back-to-back airings of "American Chopper", but after struggling to come up with a good way to mount my Creative Zen Micro in my car this idea struck me.
Essentially, by using an old travel mug and a 20 cent "L" bracket that I had laying around, I hacked together this solution. The bent "L" bracket slides into the Zen Micro's case on one end, and into the "sip hole" of the coffee mug at the other.
The good news is that it is secure, the right height with adjustable angle (just spin the mug so either the driver or passenger can easily read) and best of all, a place to store my player when I park. Hopefully, this will keep any potential thieves from breaking in (unless someone is just dying for what looks like a cup of stale coffee). I'm thinking about trying to run the wires (mini-jack to cassette adapter and cigarette lighter to mini-USB charger) through the bottom to clean it up a little. The bad news... that mug won't ever see coffee again.