I may be late to the game on this one, but I have found DailyLit.com and am in love. What’s DailyLit? Here’s the answer from their website:
… if you are like us, you spend hours each day reading email but don’t find the time to read books. DailyLit brings books right into your inbox in convenient small messages that take less than 5 minutes to read. This works incredibly well not just on your computer but also on a Treo, Blackberry, Sidekick or whatever the PDA of your choice. In the words of Dr. Seuss: Try it, you might like it! (Oops — it would appear that the actual quote from Green Eggs and Ham is “You do not like them. So you say. Try them! Try them! And you may.”)
If you get caught in a really good part of a book, you can send a message to DailyLit for them to immediately forward you the next installment. They also have a RSS fee alternative if you prefer to get your reading sections in that format. All questions about the free service can be found on their FAQ page.