Veja se ajuda:
http://65.39.148.34/KB/aspnet/RazorMaps.aspx
http://www.gregjopa.com/2011/02/asp-net-mvc-3-with-jquery-mobile-and-google-maps/
http://stackoverflow.com/questions/6437173/problem-integrating-google-map-api-asp-net-mvc3
http://blogs.creative-jar.com/post/Google-Maps-in-MVC3-Part-1.aspx
HJ