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InsensitiveRegularExpressionValidator
Solving the problem with ASP.NET RegularExpressionValidator - it's CASE-SenSiTIvE!
 
DOMValidator
All the information you need to find Validator controls that work equally well in Netscape, FireFox, Safari and Internet Explorer
 
CAPTCHA - Automated Turing Test
Distinguish 'real' users from spambots with a visual 'Turing Test'
Useful links

RegexAdvice
Regular Expressions are the mainstay of many validation routines.

Longhorn SDK
The Longhorn documentation is lightyears ahead of .NET 1.1 documentation in terms of the detail and examples available.

ASP.NET
Check the forums and the source projects

4GuysFromRolla
Great place to start when looking for samples or 'how to'. This article particularly relevant.

ASP.NET Validation in Depth
MSDN explanation of the ASP.NET validation controls.