Professional
Synthetic Biology
It may be a bit of a buzzword, but I think a new paradigm in biology is right around the corner.
Astrobiology
Discovering new life, or seeding it on other planets, is something I think about every day. I recently wrote about terraforming Mars with engineered organisms on the American Society for Microbiology's "Small Things Considered" blog.
Algae/Biofuels
Sharing some of my thoughts on environmentalism at STOTalks in 2012: