I once tried to build a web site with content tied to locations down to the smallest towns in all countries, and I found it hard to get everything right. So I t

I once tried to build a web site with content tied to locations down to the smallest towns in all countries, and I found it hard to get everything right. So I think it would be interesting to have maps, all kinds of geographical information along with some related algorithms "for lease": e.g. find the nearest city to a given location, IP-to-location, address format for a given country for building proper entry forms, phone number formats, districts/county/states for a country, etc. The database of localities and all associated information is not only huge, it's changing literally every day and thus should be constantly kept up to date. Definitely a good candidate for the hosted service scheme.