filming is tough... IMHO for a good video, you have to go out with the intention of getting footage, versus going out for a hard ride. kinda like taking photos on the trail, it'll interrupt things quite a bit if you are looking to just ride.
that said, i have always thought about putting together some videos of stuff, but i'm not good enough to ride half the crap or to go fast enough to make anything look exciting... even for me to watch myself.
i dont mind riding with the intention of taking photos. i do ride so much, i sometimes would like some more pics... at least more than the "there i am once again at the starting line of a race i didn't even come close to winning" shots, but usually when i am out with other people, they generally get annoyed if i try to take a pic here and there too much. i can understand that tho... so now i only bring the camera out on solo rides.
my bro-in-law has some decent footage of some local parks. his best videos are the ones that have the shots from off trail, versus just showing what the trail looks like from the vantage point of a helmet. the editing time takes him a while. i have tried to post his stuff on youtube, but i haven't had the time to look for a good DVD to youtube format converter...