I'm trying to determine how this works. I would try to figure it out myself but am not near my rooter at the moment.
EDIT:
Alright. You register an account and your location/WAP, register the WPA2 key, etc and it is all handled through their (Whisher) servers. You drive around with the Whisher client open and it will tell you when you are able to connect to a Whisher AP. The key, depending on if you are part of the group that is allowed the key, is then "securely" sent to you in some manner so that you may connect.