Dazzboard is a service that acts as a simple way to sync all of your multimedia across multiple devices. Devices supported range anywhere from a simple mp3 player to an Android phone. iTunes Library is also supported.
Dazzboard is based on the web, but acts as a local syncing program. The plugin is required for it to work on Firefox, Chrome, Opera, Safari, and IE. After the plugin is installed, just visit Dazzboard.