AlgaeGeek.com
I have a bizarre fascination with algae. There is a lot of science going on with algae for use in food stuffs, in detoxifying industrial waste, and even as food. But my geek-itude is vastly exceeded by Jared Bouck, whose created an entire site about the cultivation of algae. I’m bookmarking this for later fun.
httpv://www.youtube.com/watch?v=RSeHW_tV65k
Addendum: While reading the algae page on Wikipedia, I found a link to this book on identifying freshwater algae in the United States.