I often times see students searching the web for that perfect picture to use in a report or presentation. While Google Images is great, its not really fun. Then there is Tag Galaxy. Students (or teachers) enter a "tag," a search term into the engine and press go. You are presented with the results of your search organized into a galaxy. Below is my search on civil war.
From here I can click the main "planet" and see all images that have the civil war tag or I can click one of the smaller planets and see things like battlefields, soilders or history. Once I find an image I can visit the site where the image is based and retrieve it there (following copyright and fair use guidelines of course!)
Check it out!