Wireless Security

Any one have a good source on securing a wireless network with Linux?
I'm *very* concerned about security but want to go wireless. Thought I'd
check in here first for sources that ppl may have already found to be
good.
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Carl Parrish (cparrish@carlparrish.com)
http://www.carlparrish.com
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Registered Linux User #295761 http://counter.li.org