http://planetary.org/news/2004/tpr11-12_04toc.html

Cosmos 1: The Journey Begins!

It’s finally happening! Our Cosmos 1 solar sail spacecraft—the most ambitious project The Planetary Society has ever undertaken—is ready to leave Earth and begin its journey to space. We’re ready to make history by proving that the Sun’s light really can be harnessed to propel a spacecraft—a technology that could one day lead to interstellar flight. For four years we’ve reported on the ups and downs of this precedent-setting mission. Now the spacecraft is built and undergoing its final checkout, and we couldn’t be more excited. Here, we share the mission details and chronicle the development of the spacecraft as we gear up for our March 2005 launch.

http://planetary.org/solarsail/index.html