Well, I just discovered that Barnes and Noble have installed WiFi in some of their stores already. In the 8th Street location discovered this very quickly. There is no encryption so beware of sniffers looking at stray traffic. It is great for research but bad for transactional pieces (banks, e-mail.)
I also got an e-mail from B&N telling me that by next week, all of the stores will have it for free for you to try as they experiment and that there will be a locator website for you to find the latest update on where they have spots.
http://www.cometahotspots.com
These folks also have McDonalds as well though I will NEVER buy stuff at McDonald just to try out their service unless I was really desperate.