Every Mac comes preloaded with 1.3 bazillion languages. While this is very impartial of Apple to think of the little guys, most people only speak English and one or two other languages. So all those extra language files take up hundreds of Megabytes of valuable hard drive space.
Enter Monolingual, a free and Open Source application that removes unnecessary language files, and frees up hundreds of Megabytes, possibly even Gigabytes of space! Anyhow, I used the app, and I was quite happy with the results. My next step is removing all the factory loaded apps I don't use!