I’ve been wanting to play with HTML5′s canvas for a bit now and I’ve always liked Conway’s game of life since it was introduced to me in first year CS so it seemed like a good match. In the spare time of a few days I was easily able to cobble it together, and even add some nice controls and one novel (to me) feature: the rainbow color age effect, which cycles the color of the cells and darkens them with age so you can quickly see the age of cells on the board and get a pretty show.
HTML5′s canvas is fun for simple things like this. I don’t know how it would a) hold up for more complicated and practical applications, and b) how much “fun” it would still be. Maybe I’ll find out, maybe not.