Urban mountain biking

YouTube link. 

Filmed at the Valparaiso Cerro Abajo 2010.  One wishes that he had aimed the helmetcam just a tad higher, but it's still impressive.  The above link is the one that most bloggers have been using; there is also a bystander-view video here, and others searchable at YouTube. 

p.s. - I'm now testing adding a "YouTube link" for those viewing the blog via readers and mobiles.