Sullr: Reverse phone lookup
Sullr (in your iphone will redirect to http://sullr.com/iphone) is a tool for obtaining information from telephone lines in reverse mode. Very quickly, it will allow you to know the name of the person responsible and find on the map the address where he is. And its integrated with google maps!
At present, we only have 5 countries available: Argentina, Belgium, France, Italy and the USA. But we are working to offer many more (as long as the laws of each country allow it).
gull be nice a native app for this. Any interested? :)