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Here is some good starting points for reading on WLAN and security that I and my colleague found on the net.
In our opinion, we think its scary that we already have seen "proof of concept" of several WLANs that have been insecure, especially those default installations, that we have seen a lot of in real life.
You may wish to review Product Bulletin No.1327 http://www.cisco.com/warp/customer/cc/pd/witc/ao350ap/prodlit/1327_pp.htm for further information.
Thank you for posting.