Here's the 'how to' cut n' pasted from the article:
How To Make Seed Balls
Emily Gallagher, a NAG member who specializes in open space issues, says it's easy to make seed balls.
"First, we mix the mulch and a seed mixture," Gallagher says. "We try to pick a seed that is native to the area and can withstand drought. We mix those together, and then we knead it like bread into a red terra-cotta clay. It is important to use the red terra cotta, because other kinds have different chemicals in it that affect growth."
The mixture is rolled into little balls, which then has to dry. The group then puts them in bags and distributes them. The mud and clay protect the seeds from being eaten by birds and rodents. After three to five rains, the balls break down and the seeds germinate.
Read the full article and check out some pics of seed ballin' in action here.