If you suddenly find your files have been accidentally deleted or lost from your Mac, what can you do to get them back?

A sure-fire way to prevent your Mac from slowing down and avoid errors like "Your startup disk is almost full" is to ...

So, I finally bought 10.3 and it asks me if I want to format with a UNIX or the standard Mac file system. I've read lots about whether to use journaling or not (I will) but I hadn't heard about this ...