As developers we're constantly faced with the need to crank out good quality code.  This isn't often the easiest task, especially with the mounting need to stay at the forefront of technology.  Visual Studio, while a powerhouse development environment, can only offer so much.  Here is a great list of tools that should be a part of every developer's toolkit.  These tools will aid in the generation of good, quality code and keep the productivity high.  Additionally, Scott Hanselman has his Ultimate Developer and Power Users Tools List, a recommended set of tools that all developers must know how to use.

Of these tools, I have loads of firsthand experience with NDoc (love it!) and FxCop (currently version 1.3) and the Regulator.  I've played with several others.

Some other tools that I really find useful and enjoy are:

Aaron Skonnard's XML Tools

The VS.NET Command Prompt (invaluable - I moved this shortcut to my Start Menu for quick access)

ISO Recorder - invaluable tool for creating images of your CDs

Notepad 2 - A very capable replacement for the boring, ordinary Notepad...try it out! it's awesome!

UltraMagnifier - Excellent tool for giving presentations

What tools do you use?