ipod to HTC extUSB adapter
No, it does not exist yet (to my knowledge).
Essentially what it'll do is connect any HTC extUSB equipped phone to any kind of ipod docking station.
My car's head unit has an ipod cable along with steering wheel controls so what I want to do is be able to connect my TP2 to the head unit via the ipod cable such that I can control the TP2's audio from my steering wheel (and possibly on a more advanced note display the track info, though I'm not too optimistic on that). Yes, I know it would be easier using the extUSB to 3.5mm adapter but then I'd have to control playback on the phone (or possibly through MSVC if it ever listens to me correctly).
I know the pinouts of the extUSB port and the Ipod connector. No problem making an adapter there for strictly the audio and charging part. The fun part is adapting the Ipod's control signals (for next/prev track, play/pause, etc). I have not come across any kind of technical data sheet indicating the kind of signal the HTC phone is looking for to control playback. I have a E100 remote that I'd rather not reverse engineer yet. For some reason I believe drivers will need to be involved in this one.
Anyone who can help out with playback control signal info for extUSB, I'll gladly send one of these adapters out when I get around to making them.