A new book called Robots in Space has just been published by The Johns Hopkins University Press. The book by Roger D. Launius and Howard E. McCurdy jumps into the exciting debate of human space exploration versus robotic space exploration. See a full review of this book at The Space Review or buy it on Amazon.
Also, a symposium was recently held by AAAS to show off past, present and future Mars rovers. The newest rover, the Mars Science Lab Rover (MSL), hopes to be landing on Mars in 2010. MSL is powered by a nuclear engine and should last for 20 years. It will also be equipped with a laser nicknamed the Death Ray, for pulverizing rocks in order to examine them. See all the details with lots of photos at io9.