Joe,
It's coincidental you posted this thread. I've only recently discovered the amount of airbrushing and modelling videos on youtube (to be honest though, i'm not much of a youtube person).
I was actually wondering how many other modelers out there check stuff out on youtube. I certainly found a lot of benefit from watching those videos people upload where they show your their techniques and how they do something.
For example, i've always had trouble doing paint chipping, however, watching videos, it's given me a much better understanding of the technique, something I just couldn't seem to pick up from reading articles (and i've read many many articles to try and learn it).
I've also found that videos on painting people to be very useful too.
I'm hoping it helps to expand and increase the interest in model building, whether it's traditional models or the Gaming models (which a lot of the videos appear to be focused upon).
Anything that helps to spread this hobby is a bonus.