I usually don't have wifi while I am out and about, most stores at least require you to hit accept on their terms and conditions before you can actually connect. Maybe if they showed wifi hotspots on their coverage map I could get behind this idea.
Yeah, I don't know how they do this, but Google says they have pre-approved WiFi hotspots the phone will automatically connect to. From this, I wonder if security will be a concern for some of these hotspots.