The natural follow-up to the liquid nitrogen ice cream post ...
I'm a big fan of Alton Brown. As Leo put it the other day, "he's the Bill Nye (the Science Guy) of the culinary world." In that sense, Alton is the layperson's gateway into the world of Molecular Gastronomy. Oh, and did I mention that he also was the DP (director of photography) for REM's "The One I Love" video?
Here are some other resources, courtesy of 101 cookbooks:
Mark Powell's Food Hacking site
Also big on the food science front: Louisa Chu
A Molecular Gastronomy Resource List
For the cook that really has everything: the anti-griddle
Finally, The book and The man