Wireless networks are becoming more and more popular.  At some stage your company will probably be looking to deploy a wireless network and will be looking to you to set up it in a secure manner.  CWNP are providing free the Official Study Guide to become a Certified Wireless Analysyis Professional.  While the CWAP exam is now retired and is now part of the Certified Wireless Network Expert certification, the details in the Official Study Guide are still very relevant and useful.

Enjoy !!