There are Science Cafes all over the world that have scientists give talks to laypersons: sciencecafes.org
Nerd Nite does the same thing, but with beer: nerdnite.com
Be a guest speaker at high schools in your area. Mike Merzenich graciously came to speak to my Neuroscience students, and they found it informative and inspiring.
Above all, practice talking math to non-mathies. Use lots and lots of analogies, and don't forget to tap into the enthusiasm that brought you to the field in the first place.
Nerd Nite does the same thing, but with beer: nerdnite.com
Be a guest speaker at high schools in your area. Mike Merzenich graciously came to speak to my Neuroscience students, and they found it informative and inspiring.
Vi Hart does some really really neat math videos: http://vihart.com/
Above all, practice talking math to non-mathies. Use lots and lots of analogies, and don't forget to tap into the enthusiasm that brought you to the field in the first place.