Well, it isn’t a toilet finder but it is something. Google have teamed up with Motormouth to produce a Google Gadget that you can put in iGoogle to look up the cheapest petrol prices in your area. From an iPhone you can access the gadget using the browser but your location has to be put in separately. After that it comes up with a nice map view. If FuelWatch happens, this will get better in terms of up-to-date pricing (if the government allows access to it that is) and I can imagine an applicaiton that allows you to find the cheapest petrol on your route. For now, this is something at least.