.NET Decompiler

Salamander .NET decompiler Salamander is a .NET decompiler that converts executable files (.EXE or .DLL) from Intermediate Language (IL, MSIL, CIL) binary format to high-level source codes, such as C#, managed C++, Visual Basic.NET, etc. For more than 8,000 classes that have been tested, Salamander always produces equivalent and recompilable codes that are remarkably close to the original source codes.
Program Transformation Wiki / Dot Net Decompilers
Anakrino (www.saurik.com)
http://www.wiseowl.com/