Attention portable Mac users: two tips Wot I just got from here:
http://www.tidbits.com/ →[More:]
1: If you hold down the Option key when dropping the AirPort status menu, it lists available networks in order of signal strength, rather than the usual alphabetical sort.
2:
CoconutWiFi is a freeware app that lists wireless networks and, essentially, which are unencrypted and open.
Nice.