It looks like this:
As you can tell, I'm already connected to StayOut!.
If I put my iBook to sleep, it would simple reconnect to my last network as long as I'm in range.
If I was out of range from my network, the airport would show no signal, like this:
You can then click the AirPort icon, you'll get the pull-down menu like in the first picture, then you can select which network you want to join - provided that it's open or if you know the password.
I had a lot of fun this weekend at work using
iStumbler. It's a cool little free program that will show you all the wifi networks that you can pick up where ever you are.
I found six networks that were wide open and had no encryption.
Another great app is
KisMAC.
I also dig the
Canary Wireless Digital Hotspotter. Got to get me one of those.