I was browsing around the AHA page at beertown.org and just noticed this:
Sounds like a great deal and should push you over if you were on the fence about joing AHA.AHA Big Brew 2009 Membership Offer
Join the AHA and get a free book! To celebrate National Homebrew Day /AHA Big Brew 2009, the AHA is offering a free copy of Brewing Classic Styles,by Jamil Zainasheff and John Palmer. To receive your free book with any AHA membership, visit our online store, purchase any AHA membership, use the code "09bigbrew", and the book will automatically be added to your basket. Shipping is free for US addresses. This offer ends at Midnight, EST May 31, 2009.