http://www.nytimes.com/2008/11/10/business/worldbusiness/10kindle.html?_r=1&ref=technology&oref=slogin
The deal lets Google sell electronic versions of copyrighted works that have gone out of print.

There's already a lengthy discussion here (69 posts, so far):
http://www.mobileread.com/forums/showthread.php?t=31189