The Syngress 70-293 book is the most popular 70-293 book out there. I read through the entire book as well as some of the MSPress book for 70-293, and the Syngress book was definitely superior.
I never read his 70-293 book, but Tom Shinder is a smart guy and very talented author. I have all his ISA books and another one he wrote titled Configuring Windows 2000 Without Active Directory.
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http://www.syngress.com/catalog/?pid=2550
Good luck on 70-293!