Take a look:
ASP.NET MVC Model Binding – Part1 and Part2
http://www.codeproject.com/KB/aspnet/AspNetMVCModelBinding.aspx
http://www.codeproject.com/KB/aspnet/AspNetMVCModelBinding2.aspx
6 Tips for ASP.NET MVC Model Binding
http://odetocode.com/blogs/scott/archive/2009/04/27/6-tips-for-asp-net-mvc-model-binding.aspx
Custom Model Binders in MVC 3 with IModelBinder
http://buildstarted.com/2010/09/12/custom-model-binders-in-mvc-3-with-imodelbinder/