Free WiFi is a pipe dream. It turns out that people don't want strangers to use their network -- if someone downloads child porn through your connection, for example, you're still going to catch some heat even though you have an open WAP. I just bought a Linksys router to run Linux on, and they've got a huge sticker covering the Ethernet ports reminding customers to secure their network lest "unauthorized users" get at it.

This is the same problem Tor exit nodes have, although I suppose Tor is more likely to contain crap -- one of my friends recently ran an exit node at a University, for research, with the OK of the IT dept, and still got a legal request for the machine.