I took the HDR tutorial and not only did I learn a ton (I had never shot one HDR before the online seminar) but I made cool friends and still have copies of the tutorial to reference. I do not shoot everyday and I forget a ton of things, to be able to shoot back into the seminar and refresh my memory is worth the money alone.
Right now you and a friend can sign up for the class for a special price, I am actually going to sign up myself and one of my employees as a gift as he is just starting out and this will get him up to speed in a very short time frame.
Here is the link to use for the special deal: http://goo.gl/LGsWx
I usually never promo anything I have not used, in this case I have paid for with my own money and will again. You cannot beat this price for the amount of information you will get.