http://www.hexblog.com/ida_pro/pix/idabook.jpg ("http://nostarch.com/idapro.htm")
This is not the first book about IDA Pro. However, this is the firstbook I recommend to anyone using IDA Pro because of the following points:

Comprehensive: it describes all major IDA featuresby starting at the beginning and going all the way to the end.Experienced users may be tempted to skip the first few chapters; resist thistemptation and you will discover something new (I did
Accurate: it is very difficult to be detailed and precise when describingsuch a complex product. Chris does it excellently well.
Real: handles real world malware, packers, and obfuscated code
No fillers: it is direct and conciseProfound: this is not just a collection of recipes or tricks, but will giveyou a better understanding of the IDA architecture, thus saving youfrom unnecessary frustration. Knowing the limitations of your tool is just asimportant as knowing its capabilities.

It comes tons of code snippets, scripts, and sample modules. Programming for IDA Pro is coveredtoo: from simple plugins to processor modules.
If you want to use IDA efficiently, get your copy from No Starch Press ("http://nostarch.com/idapro.htm")!
UPD for numerologists: the book has exactly 640 pages, no less, no more!

http://hexblog.com/2008/08/the_ida_pro_book_1.html