Very Unique Adapter
This 3.5mm Stereo Plug to Plug ( Male / Male ) Gender Changer is a very unique adapter and is the only one after my 30 minutes of web search. This is a perfect fit for "cordless" connection between car AUX 3.5mm and a light weight compact MP3 player. Works well. One suggestion is to make it better looking by placing a plastic/rubber sleeve around the 1" metal body. Car owners do not have USB but 3.5mm AUX only should be happy to have this. It is not available from Amazon or other popular stores including Radioshack. Similar male-to-male cable is everywhere though.
ConsMetal body can be made prettier like cable cord head.