Michiel has an interesting article on his site that outlines a company called Fon that you can sign up to to share your WiFi access point out to its members.
I think this is a seriously bad idea.
The reason I think this is that the AIVD, FBI, whatever, spend far too much time and resources monitoring internet traffic instead of actually catching real criminals.
If they trace the download of illegal material to your network you are more than likely legally responsible for it.
And if you have FON then you may be legally culpable, but totally innocent.
Another thing is that most Broadband providers put in bizarre clauses for misuse of connection.
This could be interpretted in ANY way by their legal department.
As I live on the net the last thing I want is to lose my connection. [I have lost it before, but I forgot to pay the bills!]
So I think I will forgoe the Fon idea until someone else has already been through the legal precedant bleeding edge.