Here's a nice handy McDonalds' Wi-Fi Guide. That you can either print or kee it in you mobile devices. The guide helps you "setting up Wi-Fi connection in Microsoft Windows XP, Windows Vista and Mac ... "
The link to the guide was tweeted by Paul Smalera:
McDonalds Wi-Fi Guide. Windows VS Mac ... "Says it all!" twitpic.com/5vbvf9 via @twitpic
Here's the picture of the McDonalds' Wi-Fi Guide: (click to enlarge)