solar swashbuckling

from the planetary society comes word that cosmos 1, the first private solar sail craft is ready for launch on june 21, 2005. solar sails have some very poetic capabilities:

Ultimate space-manufactured solar sails will allow the possibility of Earth-Mars round trips with durations measured in months rather than years. The same technology may allow visits to the nearer stars at solar-system exit velocities higher than 1,000 km /sec. The one-way travel time to the Sun’s nearest interstellar neighbors (proxima and Alpha Centauri) will be about 1,000 years for such spacecraft. Advances in laser and maser power-beaming technologies may eventually substantially reduce interstellar-voyage durations.

that is a remarkable 0.003c.