www.alphadictionary.com

The Economist has an article on where the forms of "you" are going in languages. It appears most are losing the formal version, though a few are getting stricter. It's not very in-depth, but worth a read:

http://www.economist.com/blogs/prospero ... y-language

Last I knew, the distinction was still in effect in Russia. How about other places?

With several Hispanics (Mexican and Cuban) I have met in the last ten years, we have gone almost instantly to informal tu ands second person verbs.