re: That's the other side of the coin
I've set up the AirPort both with encryption, a password, and a requirement to actually key in the network name to get on board. That's about as far as I can take it, and still have it work. You're device list idea is probably one step better. I've got PCs and Macs on the same network, although I have yet to get them to talk to each other directly. At least everybody can talk to the internet and the printers.