Scott Guthrie's 4 part series is probably a good starting point:

http://weblogs.asp.net/scottgu/archive/2007/11/13/asp-net-mvc-framework-part-1.aspx

Here is a sample app you can take a look at as well:

 http://dotnetslackers.com/articles/aspnet/KiggBuildingADiggCloneWithASPNETMVC1.aspx

 Here is a preview of the upcoming changes to mvc:

http://weblogs.asp.net/scottgu/archive/2008/04/16/asp-net-mvc-source-refresh-preview.aspx