We recently got a copy of Sea of Cortez - A Cruisers Guidebook. This is one of the most beautiful guide books we have seen. Some cruisers coming north showed us the book and said they found the information was very helpful and accurate. The book is full of high quality color maps and pictures of hundreds of anchorages. Nice commentaries about local sites and services accompany most of the entries.
The authors, Shawn Breeding and Heather Bansmer, have also set up a complementary web site at exploringcortez.com.
Amazon.com - Sea of Cortez: A Cruiser's Guidebook