Another WiFi network appeared in iStumbler this morning, which brings the total to ten. There were two (mine included) back in 2001 when I moved in, and four last summer. I'm actually hooking into private networks from across the road.
So far, I've suffered no disconnection, no bandwidth reduction, no wake-up reconnection problem since I installed the update this morning. Fingers crossed.
Update: just when I tried to post this entry, the network dropped. Drats.