You're the man WifiMaxed!
Looks like HTC took a cue from Motorola and made the connector between the dock and the mount a universal ball mount that's used for GARMIN's!
What does that mean exactly?
Well, for those that don't really like suction cups for their mount, this form factor allows you to use any of the mounts available for Garmin's.
I personally decided to try out a vent mount and it's been working perfectly for my MoPho car mount:
Amazon.com: IG-A03: i.Trek Vent Mount for Garmin Nuvi 200, 200W, 250, 250W, 260, 260W, 270, 205, 205W, 255, 255W, 265T, 265WT, 275T, 500, 550, 680, 750, 760: Electronics
There's also proclip mounts that I actually might finally decide to go with because they have mounts specifically for your vehicle:
Device Holders and Dashboard Vehicle Mounts*-*ProClip Car Mounts for Mobile Phones, Tablet, and Handheld Devices
-EDIT- The one thing I'll add to this is that Motorola actually provides both a charger and an adaptor that has a 3.5mm output connector, so that allows you to charge the phone AND connect the phone to your car speakers via 3.5mm w/o having to use the 3.5mm input on the phone.
Before people respond saying, "just use bluetooth", keep in mind that bluetooth sync is not something compatible with all cars, so majority of the people out there won't have that option. I don't even have an AUX input on my car, so I have to use a tape adaptor!...LOL.