A very quick late night update: The Planetary Society's Lightsail-1 spaceshiphas deployed sucesfully according to it's telemetry, although I've yet to hear an independant confirmation by ground observation. Here's a link to the mission control updtes, and here's a website with some data on how to spot the sail in the night sky, and how long it will take to de-orbit.
Well done to everyone at TPS!
|Above: Nanosail D, a very similar sail to Lightsail-1, deployed for testing. Courtesy of NASA|