There are lot of arguments for and against the liberalization of copyrights regarding music and movies, and they inspire much debate. They revolve around restricting access to culture or restricting access to things in which everyone can share limitlessly (ie, unlike physical objects, a single "shirt" can cover the backs of a billion). In the end, of course, the debate is about music and movies and it's inescapable that, in truth, giving people access to them doesn't really matter that much.
However, I feel that the issue is much more serious for books. Indeed, our society recognizes the importance of "book sharing" by funding free book sharing centers across the country (aka libraries), robbing the publishing industry of millions each year. I would support every effort to extend this to the digital realm.
For the time being, however, I have no qualms about accelerating the shift through a bit of civil disobedience.
There is, in fact, a surprising amount of ebooks available through file-sharing (so far i've collected 25GB). Most of these seem to be non-fiction (which is good), but many novels are also out there. A simple google search for "ebook torrents" reveals plenty of bittorrent links, which are usually sizable collections of books. If the moderators permit, this thread could be a discussion of good specific sites, torrents, and other links.
UPDATE: I'm collating a list here:
OK, so far the list of illegal sites is:
http://search.digitalreading.net/
mIRC (not a site)
non-DRMed Legal sites:
www.fictionwise.com
www.baen.com