This, my friends, is where FaceBook starts to actually gain value as a business. I know the comments so far have been snarky - and yes many businesses already provide this for 'free' - but if the end-user experience is consistent this could be fantastic. Hell, if you're using 4Square why not? Before you go into the whole privacy rant remember that you're probably leaving more than enough breadcrumbs and digital fingerprints for someone to track you - telling them where you shop or what places you frequent
...may or not be of concern.
Personally, I think this is a good thing as it could bring consistency to "free WiFi", and improve the experience for the masses.
There, I said it.