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
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.