In the above video (Egyptian Arabic with English subtitles), teenage polyglot Timothy Doner, featured last week in The New York Times, talks about his own Arabic study and some of the different uses of formal and colloquial Arabic.
While I personally don’t agree with his rigid division between the two, his abilities are impressive, especially given how little he’s studied Arabic and how many other languages he’s learning. Inspiring? Intimidating? I’m still not sure.