Once upon a time I carried around a car stereo faceplate when I wasn’t on the road. I often thought, wouldn’t it be nice to have a home stereo system where I can attach the faceplate to? Now that we live in an era where many people dock their phones and iPods while at home, this idea doesn’t seem so far-fetched.
Unfortunately there are no universal connectors for faceplates, so a home dock would need to be tailor made for a specific brand (Alpine, Bose, Sony, etc.). Despite that drawback, this is an untapped market in my opinion.