Ajax callback on success and failure

AJAX
http://stackoverflow.com/questions/14220321/how-to-return-the-response-from-an-ajax-call

JSON
http://api.jquery.com/jquery.getjson/

Find nearest marker in Google Maps

http://stackoverflow.com/questions/4057665/google-maps-api-v3-find-nearest-markers

MVC with sharepoint

http://jcapka.blogspot.co.uk/2011/02/asp-mvc-and-sharepoint-2010.html?_sm_au_=iVVt50N7QGDWMttQ

http://simone.codeplex.com/wikipage?title=Host%20Aps.Net%20Mvc