External script

I’m just getting into Blender scripting (not new to programming), and would like to move some of my code into external files that I would then be able to access from multiple .blend files. I found a reference to external scripts in the Noob to Pro book, but that was for, I believe 2.49.

How can I move code outside of my .blend files for reuse?

http://www.blender.org/documentation/blender_python_api_2_65_9/info_tips_and_tricks.html#use-an-external-editor

http://www.blender.org/documentation/blender_python_api_2_65_9/info_quickstart.html#running-scripts

http://www.blender.org/documentation/blender_python_api_2_65_9/info_overview.html#script-loading

http://www.blender.org/documentation/blender_python_api_2_65_9/info_tutorial_addon.html#install-the-addon

http://wiki.blender.org/index.php/Doc:2.6/Manual/Introduction/Installing_Blender/DirectoryLayout

Thanks for the links!