We've also seen a huge interest in using this cable together with a home stereo or with the "old boom box". Very cool application is to connect the Galaxy phone to a boom-box and put the handset into the beach bag (9ft is a loooong cable!).
When you inserted the cable the "DockMode" will start. Download an app like the iBOLT Dock'n Drive and mange your favorite apps this way. You can also set Slacker Radio, TuneIn or Ulysee Speedomter or CarHome Ultra as default "home screen". Note that you can also set WiFi and Bluetooth to go on or off automatically when handset is connected to the cable.
This new version of the "Dock'n Play" cable should be static free and will provide great sound quality. Feel free to use this thread to ask any questions about Samsung DockMode, aux-out etc. The developer for CarHome Ultra and Ulysee Speedomter can also chime in and answer questions if there's a need. Have fun!
The price is $19.95 and it's available for Amazon Prime for a few days (only a few hundred in stock).