Hi there,
(I don't have a youtube account, or I would have just posted something under one of your lessons . . ) I just wanted to say thanks for making all of these wonderful math-help videos. I'm a Canadian graduate student in the process of applying to Ph.D programs in the U.S., so I'm currently studying for the GRE. I've been using your website a lot lately; it's proven extremely useful in removing some of those mental cobwebs that have set in since high school math, so many years ago.
All best and keep up the great work!
Adam