Adopt the Sky is a nice execution of an online petition site. It’s campaigning for clean air legislation across the US. There are lots of sites like this about, but this is case study material.

As the blog “It grows on trees” says:
You’ve got your new interactive media. You’ve got your bringing of the people together in a new community. You’ve got your empowering of your user. You’ve got your explorability of notes from other people who have adopted a patch of the wild blue yonder and your searchability of friends and their patches of sky. You’ve got your completely new paradigm, child. It’s social media, and it works!
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