From MP3Car.com Wiki
Both software and hardware is developed by members of the mp3Car community. These products run the range of the product development stages from concept to finished product. These forums are a great place for finding and fine tuning product concepts, as well as finding interested beta testers who are happy to try new products out, especially when they are free.
[edit] Hardware Development
To find our what hardware is being developed in the forums, go to the Hardware Development[1] forum. Some members even have their own forums for product development there. If you have an idea for a hardware product, vet it there.