Some useful development tools

FxCop (Check how good your code is)

http://www.gotdotnet.com/Team/FxCop/

 

GhostDoc (Generate XML comments automatically)

http://www.roland-weigelt.de/ghostdoc/

 

MbUnit (A better XUnit Testing tool)

http://www.mbunit.com/

 

.NET Reflector (Look inside assemblies)

http://www.aisto.com/roeder/dotnet

 

Regulator (Create regular expressions easily)

http://regex.osherove.com

 

NDoc (Automatically generate documentation from XML comments)

http://ndoc.sourceforge.net