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Ever thought of putting up solar panels? Check out RoofRay, a tool that helps you do the math.
Consumers and business owners seeking to install solar power can turn to these Web sites for interactive maps and cost estimates.
Also, iPhone 3G users submit comments and e-mails about their network issues; and how to see if solar panels are worth it, sans climbing on the roof.
At Web 2.0 Summit Launch Pad, where Web 2.0 execs pitch their companies as fast as they can, Web sites take on lofty goals.