JPL will be host a webcast and chat on their Ustream channel at http://www.ustream.tv/nasajpl covering outer planet satellites like Io. The topic is called "Moons: The Weirdest Planets in Our Solar System" and has the following description:
Moons are fantastic worlds - with features unlike anything seen on Earth: giant sulfur-spewing volcanoes, globally cracked ice-covered surfaces, liquid lakes of hydrocarbons, and colossal watery plumes. Many of these worlds also happen to be the most likely places for life to evolve outside the Earth. How cool is that?
The webchat takes place at 7pm PDT (10pm EDT) tonight.
Link: Moons: The Weirdest Planets in Our Solar System [www.ustream.tv]