Like most people you probably use reflector to get the public key, but there's an easier way...
- In Visual Studio 2005, click Tools -> External Tools...
- Click Add and enter the following into the different fields as displayed in the following:
Title: Get Public Key
Command: C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\sn.exe
Arguments: -Tp "$(TargetPath)"
Uncheck all options, except Use Output window\
Idea source: http://msdn2.microsoft.com/en-us/library/bb861799.aspx