A tip to Earth2Tech for pointing me in the direction of a blog by Martin Tobias, an angel investor and former CEO of Imperium Renewables who has a lot to say about the young crop of algae biofuel companies.  The general take is overall skepticism acknowledging it will be difficult to take successes from a lab setting and scale out into full blown fuel producing ventures.  Martin did say his favorite is Sapphire Energy which recently raised 50 million from ARCH Venture Partners, the Wellcome Trust and Venrock.  Have a look at the full article from Earth2Tech