I have to agree with you about Olav. I have been producing for a number of years and have done pretty much all the tutorials there are including sonicacademy.com and pointblank online (which is incredibly expensive) and i have to say, Olav is the best at explaining things. I normally stay up till quite late when i'm doing the tutorials and i often find that through the week i fall asleep through a lot of tutorials.
This hasn't happened with Olavs videos as he keeps you interested throughout, and he makes me laugh!
The only other person that ranks as highly in my book is D. Ramirez, he has some great free tutorials on youtube which i would recommend