It's an online database of books, posted in various formats from simple text to the fancy e-readers. They're all free -- the concept of Project Gutenberg is to put every book in the public domain online so that they're free and available forever. It started in 1971 with the US constitution and has expanded continuously from there :) Best part is that since the copyrights are expired, you can print, copy... essentially do whatever you want with the texts.
I know I'm a bookworm, and many of you are too, so I thought you'd like to know!
PS: Still pregnant, still morning sick, still holding on :). 11 weeks down, 29 to go. And a rant in process over the pathetic state of maternity clothes for those of us whose sewing machines are broken.