Here's an interesting post in Business Week's Deal Flow describing a recent interview with Vinod Khosla of Kleiner Perkins. It's always interesting to see top VCs describe where they see the investment opportunities in cleantech, and it's good to see that Vinod is apparently looking into biofuels, fuel cells and solar. Note that the post didn't mention any specific such investments, although the rumor is that Vinod put some personal money into Ion America (the formerly-stealth solid oxide fuel cell company) alongside John Doerr.