YouTube for Productivity?

I am a ADD/Dyslexia poster child and needless to say easily distracted but for whatever reason I never spent much time on sites like YouTube (subconscious repulsion by the sensory overload?). Anyway, i was reading over yet another GTD like post (on lifehacker this time) extolling the virtues of the Quicksilver productivity app which was making me really jealous (though i do have a love affair going with FARR which keeps my jealousy in check). I have read tons about quicksilver but never really seen it in action and all of a sudden it popped into my head, "maybe there is some demo of quicksilver on YouTube". I'm not sure why it hadn't occurred to me before, I had actually wasted a significant amount of time drooling over the linux XGL/Beryl video captures (highly recommended if you like nice graphical desktops) on YouTube. So i took a look and sure enough there were tons of Quicksilver videos, many of them tutorials, I thought, "Maybe there are other application like tutorials" so i looked up a video on using Del.icio.us and viola! that was there as well.

The point of this is that YouTube is a great resource for instructional videos, no they aren't all professional and some are easier to follow than others but the convenience of it is pretty darn nifty eh?