Another use: http://www.state.gov/s/ct/rls/fs/2004/32678.htm aka the "Terrorist Exclusion List", one could thus use .tel as a blacklist, well there are of course enough terrorist in this world when you are looking from the US perspective. .terrorist coming soon :)
Brilliant idea - create .ter and then all the evil guys would use that TLD, then the good guys could easily catch them. Gee, the world is black and white, after all. :-)