A product of Queen Mary, University of London, this looks very interesting! The site describes itself like this.
“Explore how computer science is also about people, solving puzzles, creativity, changing the future and, most of all, having fun.”
The cs4fn magic book looks particularly good.
There is an applet where you can do some simple AI programming for a game of Noughts and Crosses ( Tic-Tac-Toe ).
Another good applet is the What is an Algorithm applet.