iTunes Agent is a small application resting in your system tray constantly looking for new MP3 players and other music capable devices connecting to your system. When a device it recognizes is connected to the system, it will create a playlist for the device in iTunes and it will synchronize that list with tracks on your device.
You may then modify this list, add and remove tracks, before you tell the iTunes Agent to synchronize the list with your player.
Sounds interesting? Head over to the download section to download the application, or check out some screenshots to see what it's all about.
If you are interested in following the development process and maybe give a few of your comments and advices along the road, please check out the development blog.
http://ita.sourceforge.net/