This is an ASP.NET MVC Validation Framework using JQuery Validation plugin & Castle Validation Component.
This framework uses model-based validation and greatly reduces the amount of code you have to write to apply validation.
There are more information at http://www.emadibrahim.com/2008/09/08/client-server-side-validation-in-aspnet-mvc/
UPDATES
I have updated the project to work with MVC BETA 1. It should compile and work right away. Just open it in VS2k8 and hit F5.