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It's no surprise that Vinod Khosla is a fan of ethanol, but he's long said that it's just a stepping stone to get us off of oil. Still, the man behind Sun Microsystems and lots of ethanol research will give the keynote address at the Algae Biomass Summit in Seattle next month. But Khosla and his venture capital are not 100 percent behind algae biofuels. He told the Wall Street Journal that, "We keep looking at algae. We've looked at one to two dozen plants, haven't yet found economics that work