Re: other reviewers' comments on Pattaya: Thanks, Joe, for NOT dwelling on that tourist trap. ANY OTHER brochure, website, or travel agent offers equal information. Lonely Planet's info given is more than plenty to fully enjoy R&R in Pattaya.
If you want to venture to the true beauty of Thailand, true land of smiles, than use LP as a terrific reference. If you want someone else to plan your whole trip and be part of a tour group, then call a travel agent or buy the "other" books.
Re: 7th edition: "Loi Krathong" (Festival of Lights - last full moon in November) needs more detailed information for more cities in Thailand and the festival itself. For me, this was THE festival of the year - great to observe pre-celebration, too. The flowers, floats, parades, food, atmosphere... This was one of my highlights of the trip. (We spent pre-festivities in Bangkok; actual festival in Ayuthaya). Joe only briefly mentions that it's "best to celebrate in the North." Don't let this discourage you from celebrating it elsewhere in Thailand.
Having traveled with various guide books, nothing so far beats the Lonely Planet guide books. But you must keep in mind as a user - all recommendations are merely recommendations. Investigate comments, take in the facts. (The comments are usually funny and helpful anyway). The cultural background information, history, and other side notes help make the difference to buy Lonely Planet instead of the others. Joe Cummings' LP books on Thailand, Bangkok & the phrasebook were superb. I liked his insight. LP helps you be a traveler, not just a tourist. (Other LP books used: Israel, Turkey, Greece, Western Europe, Baltics, Asia, and Hong Kong. They've all been worth their weight and size). If you can take your own luggage off the baggage carousel, you must use Lonely Planet.