How to get that mythical number/letter combination

It is not an extremely common need to get your public key token from a dll, but when the problem arises (custom SharePoint development) it is nice to be able to figure it out.  Turns out it is very simple; once you actually figure out how to get it that is.

All you need to do is go into your VS command prompt: 

Start->All Program->Visual Studio 2008->Visual Studio Tools->Visual Studio 2008 Command Prompt

-or-

Start->All Program->Visual Studio 2008->Visual Studio Tools->Visual Studio 2008 x64 Cross Tools Command Prompt 

Once you are in there, just type the command:

sn -T <location of dll>

and it will spit out your Private Key Token.