It's that holiday time, time to look-back with misty eyes at the glories of yesteryear. In our case, at the 11 Hottest Trends of 2011, in what proved to be a vintage year for biofuels. There were IPOs a go-go, a big comeback from biodiesel. The global ethanol fleet has acquired new popularity amongst advanced biofuels developers looking for capital light steel in the ground. Meanwhile, gasification got hot. Seemed like every algae venture headed for Australia, and Brazil and the US Navy became everyone's new best friends.