Kaplan SAT 2400, 2006 Edition (Kaplan New Sat 2400) 
Problem Solved.
Problem #1: You've studied hard for the SAT, but you're still not satisfied. Rest assured, everything you need to achieve your ambitious goals for the SAT is in this book, including advanced algebra topics and strategies for achieving a top essay score.
Problem #2: You want to increase your speed and accuracy on practice questions. This book contains strategies to help you pace yourself on the Essay section and to quickly work through questions in the Math and Critical Reading sections.
Problem #3: Where are you going to find the time to do all this studying? No long-winded lessons -- we promise. Just what you need to achieve an optimum score on every section of the test.
You don't have to put your real life on hold while you prepare for your future.
This comprehensive book includes:
The Toughest Questions
Hundreds of difficult practice questions with detailed answer explanations, to build speed and accuracy
The Most Effective Math Tactics
Focused approaches to algebra II, word problems, and the hardest math concepts you'll see on the SAT
Powerful Critical Reading Strategies
Methods for Long and Short Reading Comprehension passages and for Sentence Completion questions
Top-Scoring Essay Techniques
In-depth coverage of the criteria necessary for a perfect-scoring essay, as well as for solving Identifying Sentence Errors, Improving Sentences, and Improving Paragraphs questions
Reviews
Highly recommended strategy book. No practice tests, but excellent strategies presented in an easy to digest format.
This is a pure strategy book, like Barron's SAT 2400, and it lacks practice tests. If you want one book for SAT prep, this is not going to cut it since it lacks practice tests. One possible solution would be to pair this book with either The Official SAT Study Guide or Princeton Review's 11 Practice Tests for the SAT and PSAT, 2007. The Official SAT Study Guide contains 8 tests, from the people who make the test, but they lack explanations. Princeton Review's book has explanations and the Equating sections, but the tests are not made by the test makers.
However, it provides some of the best strategies available. If you want to know what the top tutors know, this is likely the book for you. Admittedly, Barron's SAT 2400 probably covers all of the same strategies, but when the tutors at CEEAE covered this book they all remarked at one time or another: "I thought I was the only one who knew this". The strategies in every subject area were accurate and effective. Further, the presentation was more concise and more effective than Barron's SAT 2400.
I think the best part of the book is the essay section. The College Board grades essays on a scale of 1-6, and so this book gives you an example of the average score 4. It goes through the 4 essay and gives you specific ways to raise that grade. It then gives you an example of a six. There are also numerous pratice questions.
Overall, I only have one problem with the book and that is the lack of practice tests. Though it does have review practice at the end of each section, it doesn't have a full length test. If you are going for the perfect 2400, I recommend this book and a book of just practice tests. Good Luck!