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Right now the thing I'm doing that has the biggest potential for saving the planet might be helping set up the Selected Papers Network. So, I should invite all you Azimuthers to join in, if you want.
For the basic idea, see this.
We need programmers to help out! The Selected Papers Network works with G+, but we want to get it working with Twitter, Mathoverflow, and then other sites. We're also getting ready to implement LaTeX. There are also lots of other things to do.
To see the technical issues being discussed right now, go to the issues page on GitHub.