MSDN Magazine is now listing Top 10 Must-Have tools every Microsoft Technology Developer should have...

1. NUnit to write unit tests

2. NDoc to create code documentation

3. NAnt to build your solutions

4. CodeSmith to generate code

5. FxCop to police your code

6. Snippet Compiler to compile small bits of code

7,8. Two different switcher tools, the ASP.NET Version Switcher and the Visual Studio .NET Project Converter

9. Regulator to build regular expressions

10. .NET Reflector to examine assemblies