In this episode we will take a look at how you can utilize the power of RowTests within NUnit. By learning how to use RowTests you can reduce the amount of duplicate test code which exists when doing data driven tests.
http://www.dimecasts.net/Casts/CastDetails/103

In this episode we will continue our series on how to create a build script using the NAnt build tool. In this episode we will build off the script of Part 1 and add in the ability to run NUnit tests within our script.  You can get the script for this episode here.
http://www.dimecasts.net/Content/WatchEpisode/82

In this fourth episode, Stephen Walther and Charlie Poole build classes that represent their blog and blog entries. Charlie Poole also demonstrates some useful NUnit tricks.
http://www.asp.net/learn/mvc-videos/video-408.aspx

In this second episode, Stephen Walther and Charlie Poole create the ASP.NET MVC application with Visual Studio and run their first unit tests with NUnit. Charlie Poole explains that you can take shorter or longer steps when testing depending on your confidence level.
http://www.asp.net/learn/mvc-videos/video-406.aspx

A 10 Minute introduction to test driven development and unit testing using NUnit and C#. Produced as part of the Readify Developer Network.

Aditional resource:
Improving Application Quality Using Test-Driven Development (TDD)
Demystifying Extreme Programming: Test-driven programming
Bug Busters – Test Driven Development in .NET