I have worked with Jack and Jerilyn for many years now, and their indexes, often times written within very tight schedules, are always top-notch: well thought-out, clear, accurate, all-encompassing. I strongly recommend their services, except you can't have them when I need them.
Mark Karmendy
Senior Project Editor
Osborne/McGraw-Hill

I must say this might be the best organized, logically structured, intricate subject matter index I have ever seen.  Kudos to whomever or whatever system created this  Really nice! 
Paul J. Feltovich, Ph.D.
Professor and Interim Chair
Department of Medical Education
Southern Illinois University School of Medicine

Barnes & Noble had at last a dozen books on Windows XP on the shelf, most of which do not have the word 'DOS' in the index (the main thing I was looking for) or references to shutdown hang-ups.  The one I bought, primarily because of the usability of the index,  was Windows XP Home Edition: The Complete Reference, by John Levine and Margaret Levine-Young.  Bottom line:  The 24pp index sold this $40 book.   Jack Lewis, the indexer did a fantastic job!
Carolyn Weaver
Weaver Indexing Service

My pet peeve with most tech books is sloppy, incomplete indexing. To be genuinely useful, a good index is essential, and Mastering Mac OS X is one of the better tech books at fulfilling this critically important requirement.
Teresa Trego
Project Editor at Sybex
Quoting from Amazon.com customer review of Mastering Mac OS X

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