I'm curious if there's a way to see who or what is connected to my TC? I'm sure there is, but not sure where to look. Is there a window that will show me who is on my network or the computers that are connected?
from airport utility, open the tc and then
advanced
logs & statistics
wireless clients
Just a thought to keep people off your network, what about changing or enabling your password, change your network name, and disable SSID Broadcasting. Not sure about a program.
Disabling SSID broadcast may be effective against casual wireless snoopers, but many people don't even recommend doing it at all. It makes it harder for people who are supposed to be connecting to your network, and the SSID can often be read, anyway. (This is especially true if you have Windows XP computers on your network; if they are configured to use your wireless access point, they will broadcast the SSID even when not connected when they're "looking" for it. But in any case, the SSID can often be snooped anyway.)