A new edition of classic pregnancy guide, What To Expect When You're Expecting by Heidi Murkoff, will be released in April 2008.  It is already on the top pregnancy books list at Amazon and it has not even been released yet!  My OB gave me a copy and I referred to it constantly through two pregnancies. If you pre-order it on Amazon, you get an extra 5% off.  If you can't wait until April, try the What To Expect website and sign up for the emails.  Other great pregnancy resources to check out include the Girlfriends' Guides and the WebMD Pregnancy Calendar.