In th project that i'm now evolved, we have a lot of integration with Google Maps. Basically we have addresses of the houses, and we want to show a little map, with their location... Nothing better than Google Maps Geocoding to solve this issue.
Finnaly i found something that i was looking for a long time: a Google Map Control for ASP.Net.
This control is hosted at Codeplex, and has a very good managed code API, very easy to use, and a lot of functionality.
If you need to use Google Maps in your Asp.Net applications, this is something that you shouldn't miss.