3G Solar - The third generation of solar companies include HelioDynamics, which is working on manufacturing rotating parts that can follow the sun as it moves across the sky. Energy Innovations, which has raised $29 million, and crosstown peer Practical Instruments are making "concentrators" that use mirrors to focus sunlight more precisely. Konarka Technologies, which has raised about $60 million in venture capital, and HelioVolt are working on materials other than traditional silicon, such as copper indium gallium selenium, and developing processes that allow solar cells to be printed onto surfaces other than roofs, such as windows.Fuel Cells - Fuel cells remain problematic because the chemical reactions either generate too much heat or require supercool temperatures. One answer to this problem could be nanomaterials. Promising companies in the field include CTP Hydrogen and Franklin Fuel Cells.
Biofuel - There are many ways to produce this. One potential source of biofuel is the methane stored in garbage and animal waste. Startups such as Ze-gen are paving the way for methane-to-power conversion. Even pond scum may one day have a role to play. GreenFuel Technologies has raised $20 million to work on generating biofuel from algae.
Water - Obstacles remain, but New York's Verdant Power and Ocean Power Delivery in Edinburgh, Scotland, which has raised $39.5 million, are vying to develop wave power technologies.
Wind - Southwest Windpower, which has raised $10 million, and Mariah Power are developing wind turbines for residential areas. Some startups are developing kites and balloons that can generate wind power. For example, Magenn Power makes floating wind turbines that the Ottawa company says are superior to conventional turbines.
There are other areas as exemplified by the investment segmentation that Vinod Khosla has done in this area. But, these five areas are a good place to start for venture capital firms just starting to get active in this area.
For more on venture interest in cleantech startups, see: TechConfidential PodTech.net
The presumed victim was Platial, a startup backed by Kleiner Perkins Caufield & Byers, along with hundreds of less serious mashup tools. But, as has been seen previously in comparison shopping, social networking and vertical search, Google's entry into a new area isn't equivalent to a death knell for all startups that find themselves suddenly competing with the web giant.
Platial CEO Di-Ann Eisnor wrote last week that Google has indeed disrupted Platial's business but it was neither surprising nor devastating. That's because Platial can compete on features such as community, privacy and functionality.
And even if Google begins to dominate the market for personal online mapmaking, it will do so by expanding the number of people participating in it, which should compel companies such as Ask.com, Yahoo and MSN to begin to participate in it more deeply. This should only make the best online map startups more valuable.
For more on Google's MyMaps release, see: O'Reilly Radar Robert Scoble
The responses show that after Facebook, there really is no consensus answer. NetSuite, Linden Research, LinkedIn, AdMob, Digg, NanoSolar and Tesla received multiple nominations. Bebo, AdBrite and Aggregate Knowledge, companies I think are building fast growing, profitable businesses, each received a mention. One I didn't see in the response section yet that I think holds tremendous potential is TechMeme.
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