I always thought it would be cute to get some cheap IDE hard drive docking bays, then you could rip the docking connectors off of them and rig them up to the back of the empeg and to wherever you mount the hard drives. You could then theoritically have an empeg with no internal hard drive. Instead you could have a hard drive in your car and another one in your home and "dock" to them.

More useful might be to use this "docking" connector idea to hook up an external cd-rom. Then you could play regular CD-DA and/or MP3 cd's if you hacked together some software.