I know at home I can see 3 other WLANs in my apartment building, 2 of which are wide open. Mine is encrypted (128-bit), MAC-restricted, and the SSID broadcast is shut off so a war-driver will not find it. At my MumInLaws apartment I can see 2 other WLANs but they are both encrypted and at the office of my church I can see one other WLAN which is MAC restricted but not encrypted. Scary stuff..... and SO SIMPLE to secure.....