Preventing Amazon updates
Making XBMC the launcher
Installing apps to XBMC homepage
Demo of Mupen64+(N64 emulator) and Reflector (Airplay)
Remember, if you are buying a new FireTV, make sure to follow the instructions here to make sure it doesn't update to an unrootable version. In short, either block access at the router level, or disconnect wifi / ethernet right after you start the device and connect to the network, before the download of the new version can finish.
Enjoy! Let me know if you'd like me to do video walkthroughs of anything else, like using stickmount, connecting to Windows computers over the network, etc.