I have been watching this topic for a while and am quite interested too. I just got an HG20, which so far, no one has mentioned, although I assume it would have similar firmware to the HF10/11/100. Lately I've just been examining the HF10 firmware in IDA (btw, is the free version of this much different from the paid one?).
I'm thinking maybe I should see if I can connect to the camera with calib.dll.