Nice, normally that kind of stuff you only see on north shore trails. If yer bored and want to see similar stuff (just out in the woods instead of urban area) search youtube for "north shore biking" or "downhill mountain bike racing" or something.
http://www.youtube.com/watch?v=-4YtfE59_mM there's one of a race. They do it like a road cycling time trial so they don't kill eachother on the drops. I dunno what kind of videos are out there but surely you can find some cool ones. It's kinda hard to film trail riding though, especially at races...you have to hike into the woods to the good sections of the trail. Otherwise all you get to see is the start/finish area which is generally really flat, wide and boring. And I am thinking I was cool because I could bunny hop onto picnic tables, ride lengthways down a fallen log, ride on a seesaw made from a 2x4, or handle ~10ft dropoffs or other basic mountain bike obstacles you find on most trails.