Here is a taste:
"General Motors used social media to embrace community members. When they previewed their new Camaro on the Fastlane blog, they posted a video of one of the designers driving and giving users a look at what it’s like to be behind the wheel. Not surprisingly, users then commented and created a dialog with the people at GM about what features or downloads they would be interested in seeing. GM was then able to incorporate these things into the new design."
View the complete piece here