Unless I am incorrect, each time you come along to a FON enabled router, you have to input your loginand password. Would it be possible for an application to be written that just logins in to a fon router as soon as your iphone detects it?
do you have installer.app?
For the time being until the SDK comes out you could use the APP "iFON", I believe that is what you are looking for. Its description says "Conection manager for FON hotspots".
so it can be done today. Wow, that is really neat. I don't have installer.app, I might put it on, but I am worried about it bricking my iphone.
So there already is a proof of concept, and it will probably improve when the sdk comes out. Maybe that same application sould store settings for whisher as well.