The World Wide War Drive is a periodic event where wardrivers everywhere take to the streets to scan wireless networks and upload results of discoveries in their neighborhood. The last event ended June 19th. The results for the event are now available:
Unique networks: 288,012
Networks with WEP: 91,050 (31.6%)
Networks without WEP: 146,688 (50.9%)
Networks WEP unknown: 50,274 (17.4%)
Networks with default SSID: 82,755 (28.7%)
link to full stats.