You could try this link to get you started. TI has some interesting whitepapers, but they require you to register to get access to them.

http://techupdate.zdnet.com/techupdate/filters/specialreport/0,14622,6022247,00.html

Lots of commentary there, but if you look, there's typically links to references and/or outside sources.

Here's a link to the whitepaper's section:

http://researchcenter.zdnet.com/data...s_10_34_4_2_np

As was said earlier, one of the better ways to secure a Wlan is to utilise WVPN's.

edit: Oops, forgot to post the ling to the TI whitepapers I mentioned:

http://focus.ti.com/docs/apps/catalo...igationId=5245

-Aryoche