Unless iPods and music go out of style in the near future, the market for hearing aids and hearing aid accessories will be extremely profitable. Thats why the Sound Leaf phone-microphone-thingy was debuted at CTIA 2007. Although details are
in Japanese sketchy, it does seem like it could be a very useful product. Plus, it is has the added benefit of interfacing with current hearing aids via the t-coils.
For a good time and more info, check out the translated product page . . .
Flashback: Medgadgeteer On The Frontier: Bone Anchored Earing Aids . . .