This is actually a really cool idea for a site -- Fitzcairn's Macro Explain-o-matic is basically a web script that reads WoW macros, and will go, line by line, through them to put exactly what they do in plain English. Sure, odds are that if you have a macro already, you probably have some idea of what it does, but if you've ever wanted to learn how to write macros, or aren't sure exactly what the macro your friend emailed to you is supposed to do for your character, you can just throw it in a text field, and then Fitzcairn's script will break it apart for you.