The Washington Post has an article on parkour that features some interesting background on David Belle, one of the stars of Banlieue 13, which I consider to be one of the more influential action movies of recent years.
Rent it if only to watch the chase scene involving Belle's character that opens the film. The man moves like a drop of mercury (here's the YouTube version, but it doesn't do the scene justice).
When B-13 screened at TIFF '05, the audience was told afterwards, No CGI, and no wires. And they roared!
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