At one point, I had a linux box with three NICs which was the center of my home network. One to the Internet, one to my wired LAN, one to my wireless access point. The wireless access point NIC required a VPN connection so it effectively made 802.11b safe. It was great; the culmination of quite literally hours and hours of tweaking. It ran an rsync backup of our office nightly, had SSH administration, was a file server, had a sweet ipchains firewall, etc, etc. Then the hard drive crashed... I had backups but the work of getting everything configured again was overwhelming.
Now my network looks like everyone elses and I just change my WEP key periodically.
-- Joel
PS I'm waiting for IPCop to get similar functionality as my old setup. They speak of an 'amber zone' which will allow you to have a separate interface for your wireless network due to the security flaws of 802.11b. Don't think it's ready let, though.