As said on Facebook yesterday:
Dear Book Pirates:
Taking the stuff we worked months on and passing it around to strangers without paying us doesn't make you a good person. You're not stealing from a faceless corporation; you're stealing from a small group of authors and editors who won't be able to continue putting out the kinds of books you love if people don't pay them for their efforts. We're not asking a lot--a few dollars buys you hours of reading enjoyment, and the legal versions all have sharing enabled, so you can share your copy with your real friends and family. So please, knock it off.
Long story short, don't download books from "sharing" sites. You're hurting real people.