[eluser]techgnome[/eluser]
Make it a library... then put the call in the constructor method. That's what I'm doing with a piece I'm working on. I load some configuration/initial data in the construct and then the library is available to me anywhere I have access to the $this object (which included Models and Views). If it's something you'll need in all your controllers, then add it to the Autoload config file, and BAM! you're done.
-tg