Saw some new books (well, new to me) in the bookstore yesterday about Mars geology. They are part of the planetary sciences series by Cambridge University press. I'm sure some of you here would be interested if you don't already know...
The Geology of Mars
Evidence from Earth-Based Analogs
http://www.cambridge.org/catalogue/catalog...n=9780521832922
The Surface of Mars
http://www.cambridge.org/catalogue/catalog...n=9780521872010