I just stumbled upon this recently. DailyLit.com is one of those ideas that I can't help but think "why didn't I come up with that?!?"

Their premise is this--through their website (www.dailylit.com), you can "subscribe" to a particular book. They will then send you chunks to your email (these chunks take somewhere around five minutes to read--if you have a bit more time, a quick click of a button sends another chunk to your inbox). You can select to get daily emails, only weekdays or mon, wed, and fri.

I kind of like it--I know I have something "substantial" waiting for me in my inbox and not just a bunch of spam to wade through. I just started working my way through Wuthering Heights again (its been years since I read it). Their collection is a bit small, but from what I understand, they're growing.