Has anyone here have a good Rule to follow to keep models/textures and everything else organized?

Where do you keep the stuff?  Especialy inside Bryce how do you organize them so that if you need to move the data to a new machine or if bryce is updated you can simply move the data without much fuss??

I have a bad habit of downloading models/textures into a download folder and only putting them into bryce when I need them, but than sometimes I forget which download folder I put what in, or I even forget what I have.