New cross-platform cellular automata application by Tomas Rokicki and Andrew Trevorrow. It's still in alpha stages, lots of bugs and missing features, but looks very promising: a combination of the ease of use of Trevorrow's LifeLab with the simulation power of Rokicki's hashlife.

And while I'm posting pointers to Game of Life stuff, H. Koenig's Game of Life News blog is a great new resource.