Got some new links, though I suspect this topic is a bit dead.
http://dearreader.com/Sign up for any of the email book clubs listed on this site and every day you get a 5-minute sample from a book. By the end of the week, you'll have read 2-3 chapters, and if you like it, you can go check it out at a library or buy it or whatever. It's pretty cool, and I just joined 5 clubs this week, but I'm thinking about going down to 2 because it's kind of annoying when I check my e-mail and there are a million excerpts from a million books.
http://www.poetryarchive.org/From my library's website: The world's premier online collection of recordings of poets reading their work. You can read and listen to contemporary English-language poets and poets from the past.
http://www.reader2reader.net/A site for readers to share opinions about books - what you loved, what you hated, and what you got stuck on.
http://www.bookcrossing.com/Pretty cool site, though I don't think it's popular enough to work very well. Basically, you take a book and register it with the site. They give you a number and you put it inside the book. Then, you leave the book in a public place where someone will find it and enter the number back at Bookcrossing. It's neat, kind of like a wheresgeorge.com type of thing, but like I said, I don't think it's catching on with enough people. Also, I just joined it and it seems to be a bit like Shelfari as well. I like the look of Shelfari better, I think.
http://www.dailylit.com/This e-book site charges you to download a bunch of the books, but the reason I'm listing it here is because a lot of the classics are considered public domain, so they are free.