Ok, SmartInstaller done. It sees my USB drives now and I can use the Files-> section to play the files just fine. If I use nitoTV the video starts playing, but it seems to be behind another screen.
The next problem is mounting my AFP shares. If I select the Bonjour host I get error 1069. If I try to manually set up the info (as defined in the wiki) I get “mount_afp missing”.
AFP is only able to be enabled on those Apple TVs that originally came with the 1.0 software (usually those purchased prior to October 2007). If you have a newer Apple TV, you will need to stream via SMB.