This story is close to my heart as biofuel research is the area of microbiology I'm going to be working in. This area of study has been growing by leaps and bounds. Bacteria have been found that can produce ethanol (which can be used as auto fuel), jet fuel, gasoline, electricity, and even a biodegradable non-petroleum-based plastic. These microscopic organisms may very well be the "green" alternative to fossil-fuel-based energy we've been looking for.
This article describes how the "missing" link in the Krebs cycle (or TCA cycle--tricarboxylic acid) of blue-green algae (cyanobacteria) has been discovered.