The Idea Book is out - if you've pre-ordered a copy, you should see it arriving soon. We've got a special section in our forum where you can discuss the book, ask questions, and more.
If you find any errors, please let us know so we can include it in the Errata section and make a fix available for everyone who owns the book. (Yes, errors do occur in books, but the Internet has made it so easy to find and share corrections.)
And if you own a copy of the book and attend any future LEGO events (BW, FLL, BB, etc), bring it - if any of the authors are present, they'll be happy to sign it for you.