Do you know good sources of information to get started with Unit Testing?

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• Read the Wikipedia Unit test page and learn how to write unit tests on fragile code.
• Read Tim Ottinger & Jeff Langr's FIRST principles of unit tests (Fast, Isolated, Repeatable, Self-validating, Timely) to learn about some common properties of good unit tests.
• Read Bas Dijkstra's Why I think unit testing is the basis of any solid automation strategy article to understand how a good foundation of unit tests helps you with your automation strategy.
• Read Martin Fowler's UnitTest to learn about some different opinions as to what constitutes a "unit".
• Read the short article 100 Percent Unit Test Coverage Is Not Enough by John Ruberto as a cautionary tale about focusing on test coverage over test quality.
• Read the Wikipedia Test-driven development page (optional)
• Read the SSW Rule - Test Please - we never release un-tested code to a client!