The problem with buying kids' books on the Web is that you can't flip through them before checkout. Lookybook changes that by posting the full contents of hundreds of children's books online, so you can make sure your choices are suitable. You can also review, rate and purchase picture books right on the site. Since Lookybook is new it launched last November you may not find every book you're looking for, but we think the site is off to a fine start. Lookybook is one of those sites we can't believe no one thought of before.