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WPI driver aka Intel 3945 works like a charme plus WPA/WPA2. Of course you don't have any luck with newest chipsets, but there is at least comming support for 4965AGN (aka lwn driver) in current (FreeBSD 8). So it's just a matter of time.
OpenBSD currently has support for WPA on the 4965AGN (as well as the newer 5100/5300 series)—so the nature of the code sharing between the BSDs should simplify support on FreeBSD.