Validator Toolkit for ASP.NET MVC 1.0
The Validator Toolkit provides a set of validators for the ASP.NET MVC framework to validate HTML forms on the client and server-side using validation sets. By defining a validation set, e.g. a LoginValidationSet class, the toolkit will generate code.
It looks most "programmer friendly" validation framefork for ASP.NET MVC
The API is slightly poor, but it is easy to fix by adding your own extension methods.