Why do I want to root it?
1. Use the speaker - install shairport, and now you've got an airplay speaker. (Could make it work for google play probably, too.)
2. Add VPN server so I can connect to my network from away.
3. SSH server
4. Repurpose amazon dash without running another server
5. Enable the USB port! USB Drive anyone?
6. Play with the LED - Blink Blink Blink (twitter notifier?)