Ok, so a friend asked me yesterday to help him out. He's opening up a Cafe and wants to provide free wireless internet to his customers. He doesn't want to charge, but he would like their to be some password. Something where a cusomter can ask an employee and he can verbally tell the customer. If some software needs to be purchased that will make it really smooth for any customer that's probably best.
There's really a lot of options but I'd suggest checking out PublicIP.net and the commercial but more feature rich companion PublicIP.com Good luck!