The following are a few scripts I've written for my own use, and I thought I would share them in case someone else finds them useful. If you are interested in the source code then please contact me.
Small script that takes 2 or more lists and compares them. Very useful for identifing when items are missing from one list or the other. Example
I've been looking for a while for a program that can effective compare two spreadsheet files, so I came up with one myself.