I thought I'd start a thread where people can post which tools they use when programming with .NET.  This could be IDE's, Debugging tools, Documentation tools, Languages, Profilers, etc.

I use:

Visual Studio .NET 2003 (C# coding/debuging mostly)
MSDN Library (obvious...)
FxCop (Analizes code and writes you parking tickets or something...)
Reflector (A sweeeeeet .NET Assembly browser/Decompiler)

Thats about it.  I'm looking to expand my usage of tools, so please dont be shy and list off everything you use!