BackTrack 5 Wireless Penetration Testing Beginner's Guide
Vivek Ramachandran (Author)
this book contain less theory and more practical. best book on wireless security .
http://www.amazon.com/BackTrack-Wireles ... 1849515581
its not free, but its equivalent video series tutorial is available on http://www.securitytube.net/groups?oper ... &groupId=9 by same author.