NetBouncer ASP.NET Input Validation Library
NetBouncer .NET Input/Output Validation Library's first version is out now. It has got some basic documentation as well as compiled release. It's uses New BSD Licence allows you to integrate into your commercial or non-commercial applications.
It's simple yet effective, all input validation is centralised from one place, allows you to integrate your custom plug-ins and custom rules. New Rules can be written in XML or in your native .NET language. Designed ASP.NET in mind can be used in any .NET application. Grab the source-code, check it out. If you fancy, contribute.