Johanna mentioned Orbiter by Warren Ellis and Colleen Doris. Here is the Amazon listing: 

http://www.amazon.com/Orbiter-Warren-Ellis/dp/1401202683/ref=sr_1_1?ie=UTF8&s=books&qid=1292462131&sr=8-1

Tim mentionsed Moondust: In Search of the Men Who Feel to Earth by Andrew Smith. Here is the Amazon listing:

http://www.amazon.com/Moondust-Search-Men-Fell-Earth/dp/0007155425/ref=sr_1_1?s=books&ie=UTF8&qid=1292462215&sr=1-1

Sam's website, A Life in Panels, is here: http://alifeinpanels.wordpress.com/

Daniella's website, All About Manga, is here: http://allaboutcomics.wordpress.com/author/allaboutcomics/

Tim's website, Tim Maughan Books, is here: http://timmaughanbooks.com/

You can follow us on Twitter. Sam is @SamKusek, Daniella is @allaboutmanga, Tim is @timmaughan, Johanna is @johannadc, and I'm @edsizemore.