A couple of great articles that might help the idea of growing one's own food spread.
First an article about how the Obama's are setting up a garden at the White House. No better advertisement for gardening than The First Family of Cool taking this on.
And then, how to enact one's sudden urge to get in on the game:
Here's an article describing Sharing Backyards, a small effort to help connect yard owners with people who want to garden. And then, in some areas there are even innovative new sustainable businesses trying out the same concept. See Your Backyard Farmer for an example.
So, get out there and start gardening--your land or someone's elses. The spring is here!