It's possible to find at least almost everything mentioned on this book from forums and blog posts, but I think it was totally worth of it to pay for this book. Information is correct - which is not the case with may forum/blog posts - and easy to follow.
Book contains general information about sous vide cooking, food safety and equipment, and large collection of recipes. Amount of recipes is greatly increased by having sous vide part and additions ("Chicken breast" and then "... with teriyaki", "... with ...").
If you want more motivation to buy this book, Douglas Baldwin's (book author) home page have rather lengthy document about sous vide. Just search for "douglas baldwin sous vide" with your favorite search engine and it should be first hit. However, please note that this book includes plenty of more information, including huge amount of recipes - even though there's free information, I definitely recommend buying this book.