Most people who don't own iPod and don't even care for iPhone adapters, but interested in using USB flash-drive with hundreds of MP3 files, may not even realize that the Sticky post at the top of this forum for iPod Control actually has USB Port in it.
It works great with the standard Original Factory radio with Navigator. When you plugin this adapter to your radio it pretending to be the external 6-Disc CD Changer. Each standard audio CD can hold up to 99 tracks. Therefore, this device allows you to navigate using standard buttons on the front panel of your radio through 6 x 99 = 594 MP3 Files.
That's a lot of music.
Nice gentleman by the name Rudy is currently building a set of those devices. He already build a dozens of them and successfully sold through this forum. Now for a limited time you can order yours for $299.99 shipped anywhere in the lower 48. International shipping also available (just talk to him).
If you are interested, you can read more about the device and talk to him and you can make your payment via PayPal by
following this link.
Here's the link to the last page of the discussion:
iPod Control with Factory Nav Radio is Here!