I just learned how to lock my wireless network down another notch. You can allow access to specific computers, even with an existing WEP or WPA password on the wireless connection. Now, only these two computers can log in. I found this, after searching for “wireless host monitor” in Google to see if anyone else was connected. App didn’t work, so, this ought to do.
This is located in the Airport Admin Utility under Access Control if anyone has an Airport Express.
-BOB-