I just ordered my EVO this morning. I had to call customer service to actually find one. It'll be sitting at home waiting for me when I arrive in a couple of weeks.
I found a really cool mount for it for the truck: EVO Mount
It's a tilt & swivel mount, plus has the power connector permanently mounted. When you slide the phone in, it's automatically hooked to the power. The price on it is $79.99.
I also found this one, which is the same except that it uses a cigarette lighter charger: EVO Mount - Cig Lighter The price on that one is $59.99. This is the one I'm ordering since it's a company truck and I can't hook up the direct-connect power.
I also found CarDock v2, which allows for a custom landscape "driving" home screen: CarDock v2