Here at Useful Networks we make location-aware applications, and were dismayed to learn of the shortcomings of the iPhone platform with regard to mapping.

So in the process of building our apps, we developed a framework that other developers can use, so they can create a high quality maps experience within their iPhone app, without having to write their own map viewer, or shutdown their app and open the native maps client.

mapNinja is currently available for a royalty free license, and we also have an option which is free to developers. Check out http://www.facebook.com/pages/mapNinja/65460296809

and contact sales@useful-networks.com for more info.

this is great information but could you please mention any material regarding the development of gps application using iphone SDK ?

If there is any that will be great help.