You may have noticed a new feature in Google Books. You can now download old, copyright free texts to read from your desktop or even print. I imagine it's cheaper to buy a copy rather than print, but I don't get my paper and toner for free. To find books that you can download, select the "Full view" radio button on Google Books.
I downloaded Aesop's Fables, and the book came complete with someone's hand written notes on the copy that was scanned.
Books with intact copyrights are not downloadable. In fact, Google has run into some controversy with a few publishers over the idea of books being scanned in for searches. If you've ever tried a Google Books search, you'll see why I find publisher objections to be a bit absurd. First off, you don't see the entire book. You can only read a snippet, and there are links to purchasing the full text on the right. It is yet another case of old media fearing new media instead of embracing it.