I just wanted to let you know I've started playing around with HaRET on my new shadow. So far HaRET is able to start, correctly identify the hardware, and I'm able to connect on port 9999 to do some diagnostics on the device.
Next step will be to cross compile a kernel using some of the instructions for similar HTC devices and see if I can get a linux kernel to start booting.
There's going to be some work necessary to make this thing useful under linux. Someone will need to figure out a way to map the keyboard to do t9 like input. We'll have to see if the gsm hardware and wifi hardware are the same as some of the other models too.
I don't have a ton of time to do this, so progress will probably be very slow, but I just thought I would throw this out there in case anyone else is interested in looking at it.