This is a sport I have takin' great interest in.
Parkour or Free Running has elements of martial arts and acrobatics put together. It is not self-defense.
It was founded by
Sébastien Foucan
David Belle
Yamakasi a group that David and Sébastien were part of.

Here some sites on Parkour:
http://www.foucan.com/?page_id=11
http://www.le-parkour.net/
http://www.parkourgenerations.com/
http://www.urbanfreeflow.com/

And here some videos:
http://youtube.com/watch?v=JEbYtOEftc0
http://youtube.com/watch?v=SAMAr8y-Vtw
http://youtube.com/watch?v=I-26wTjmnQs
http://youtube.com/watch?v=WkHPQPozDRs
http://youtube.com/watch?v=9WkZcP9jTqc
http://youtube.com/watch?v=ZpcTwulO6Ko
http://youtube.com/watch?v=7-X-WxqB3Gk
http://youtube.com/watch?v=LREyzofKpT4
http://youtube.com/watch?v=gHYEOvqLISM&feature=related
http://youtube.com/watch?v=t7XiqMFAld8
http://youtube.com/watch?v=TPIw3cv8Zls&feature=related

Hope you enjoy!
Who else wants to try it or does it?