The thing that I like most about the website, is that it is very simple looking and provides information in small chunks. I felt that as I went through the activities, questions that came up in my mind where answered on the next slide. In other words, it seemed really natural. I can see using this site as homework for students and for lesson plan ideas, I probably wouldn't use it during class though.
It is a basic webpage. Does not require any installation of software, and is free.