MSDN Magazine focuses on Coded UI tests in Visual Studio

Testing automation is in my opinion something that should be seriously considered in all projects that are larger than a couple of pages or screens. Now, especially user interface testing automation isn't easy, and frankly, I don't know of a product that would fit all needs.

Bu even so, Visual Studio contains testing automation for web applications with its Coded UI tests functionality. Available in the Premium and Ultimate editions, I can recommend these testing function if you are developing ASP.NET web application (and you have a suitable Visual Studio edition).

The article on MSDN Magazine goes hands-on with the said feature, and gives you a nice overview of how tests can be written and how you would use the features in practice. Recommended reading if you are looking to automate testing of web applications.