An example of crowd sourcing is the site DesignCrowd. This graphic design company is also part of another site called BrandCrowd. DesignCrowd has custom designs for people to buy and BrandCrowd includes ready-made logos. It is similar to 99Designs, and many people compare the two sites since both of them include people giving out ideas and designers sending the actual design back.
This first link explains BrandStack, which is what BrandCrowd was until the company was bought by DesignCrowd:
http://en.wikipedia.org/wiki/Brandstack
This second link is a blog that explains more about what crowdsourcing is and how it relates to DesignCrowd.
http://designcrowdreviews.blogspot.com/
