Organizing your artwork into 'Project Folders' is a great idea. But once you've done it, what happens when you want to browse all of the projects' images simultaneously? "Saved Searches" are the key. It's a useful skill, and one often overlooked by windows users.
Did you miss the earlier videos about organization? Here's one about folder structure.
If you're a Mac user, what similar technique exists? I'm sure it's easy - so share it with us in the comments below.