I just heard about Readathon 2012:
12 publishers, 24 bloggers and several people across the world are joining hands to get thousands of kids reading over 6 weeks this Summer. This Readathon, for the youngest and emerging readers, is powered by MeMeTales Reader app and website. Every week, kids get access to a free book they can read and have fun with. Parents enjoy a new activity pack with a host of relevant activities, carefully prepared by educators and publishers every single week.