Google Print Gets Sued by Author's Guild

The Google Print Library Project is getting a lot of press this week. (Here's my initial post about Google Print from last month.) Now they have been sued by the "Author's Guild", whatever that is. Sounds like a retrograde luddite organization that wants knowledge to be unreasonably constrained to me. Here is a Slashdot thread for further information. Again, it seems to me like the "Author's Guild" ought to sue libraries if they are suing Google for this; but what do I know?