One main negative of the site is the amount of clicks to get through a tutorial. Its so slow just to get any information. The concept is OK but the execution is poor.
How about a bookmarkable slide-show where the user can stop, play or speed up/down the 'flipping' of pictures. This way I can watch at my pace, stop and bookmark in the middle, and not feel like I'm playing a video game by scrolling and clicking a 100x.