Warning: do not watch this at work.
Here's how to improve your singletrack and technical riding dramatically, really quick. Turn on your irony detector and enjoy this:
http://www.youtube.com/watch?v=tLxg0dbvokQ
This may not be everybody's cup of tea (my husband didn't find it funny), but I thought it was hilarious (although I don't mountain bike). Note: it's highly ironic, up to the very end.