Have you heard of Pinterest? If not, be prepared for the sudden realization that hours have passed and you have spent all of your time in the black hole known as Pinterest. It is uh-mazing! Not only is it already full of inspirational, cute, beautiful, funny etc.. images but it is a place to store and catalog your own collection of images!
It basically allows you to browse the web and save images (AND LINK BACK TO WHERE YOU FOUND THEM!!!) all in one place. You can catagorize them and create "boards" of your images and then if need be, you can later go back to the source.
I've been using it to create wedding inspiration boards and having so much fun!