Linguist Richard Hudson uses the term "hyperpolyglot" for a person who can speak six or more languages fluently.
Fluent in 3 months is a website run by Benny the Irish Polyglot and has lots of information about various languages, Benny talks about different languages whats easy, whats difficult. Benny also offers the Speak from Day One video course + Language Hacking Guide which is his own language learning course. (Definitely worth checking out!) He also has a Youtube page where you can hear Benny talking in the different languages he knows.
PageF30 is another interesting website I like to peruse now and then in the language section.
Here is a video I just found of a 16 year old boy who can speak 20 languages! I am so jealous, I love languages very much (hence this blog) currently I can speak some basic Esperanto and I am a little better than basic Russian I am also dabbling with Afrikaans and Indonesian Bahasa.
The Polyglot Dream
How To Learn Any Language
So here is to learning a new language or two or three...