ChangeMakers http://www.changemakers.net/en-us/competition/waterandsanitation From Ashoka this problem based site is focused on using a competition to help define solutions to large scale problems. Challenges are posed, users submit potential solutions which are judged by expert panel and web site members. The selected solution is then funded by a sponsor for each problem area.
TekScout Open Innovation Network http://www.tekscout.com/howitworks.aspx The TekScout Open Innovation Network makes it easy for companies (we call them TekScouts) to post these projects and find scientists and engineers (we call them TekExperts) find R&D challenges that need solving, providing them both financial and intellectual rewards for their solutions.b As a subscription service, TekScouts can be confident that our TekExperts are serious about their intentions and motivations to solve challenging development problem
Dell IdeaStorm (www.ideastorm.com) Open environment for users to suggest solutions to dell. Social element comes in "voting" via digg like interface for the proposed ideas.
MyStarBucks Idea (www.mystarbucksidea.force.com) Users submit ideas for product enhancements, services and they are voted on by the user base. Top ideas get reviewed by company for potential inclusion.