2005. This new guide contains everything climbers need to make the most of Thailand, both on the rock and off: more than 350 sport routes, rated 1-5 stars for their appeal; info on Thai history, culture, and geology, along with useful Thai language phrases; up-to-date post-tsunami information.
Sam Lightner Jr. has spent much of the last decade and the half on Thai rock, climbing and developing new routes. If anyone can claim to know Thai climbing, it's him. I recommend this guide to anyone who's considering spending a climbing vacation in Thailand.