Hey, as I work more and more with Federal web people (my fellow nerds) I'm getting to see really good stuff from folks.
Check out Pick 5 for the environment.
The concept's simple enough: they give you 10 actions and ask you to commit to at least 5. Their Web page lets you select them and then gives you a little certificate you can print. But what's interesting is the social media options, not only the usual sharing options, but they've set up a Facebook fan page and application (one of the first from the federal gov't), plus groups on Flickr and YouTube to share photos and videos as you go about doing what you committed to.
Me, it's 1-4, and 8