I'm a new listener to the Astronomy Cast, and new reader here, but I thought this would be an appropriate place to mention a link concerning Gliese 581c.

The following link goes to an article in the online journal The Geochemical News, published by the Geochemical Society. The article provides a speculative but geologically plausible description of possible conditions on this newly-discovered planet (including some speculation about possible life there). It's sort of a literary analog to an 'artist's conception' of the planet.

http://gnews.wustl.edu/gn131/gliese581c.htm

Anyway, thanks for the great podcast.