Public Test, Private Test
One of the nicest things about being an open source developer is that other free software developers often make good development tools. Chris Dolan's recent weblog on Private Regression Tests shows how to use some of them to make the job of releasing high-quality software easier. No, this isn't about distributing tests with your software. It's about using the same testing tools you already know to use to automate all of the things you know you need to do.
What's in your directory of private tests?