Howy2012: I use a small app called dittoGUI that will put all your stuff in the right folders - I'm on a Mac too. there is a small fee for it. You still need to load one folder at a time (basically one unzipped downloaded item from Renderosity) but it's a lot better than having to copy ever single item one at a time. I recommend it. Also, I suggest putting all of your content on a seperate drive and (of course) backing up regularly.