I have always liked those hover and click interactions that highlight discrete countries/ states on a map. To make these you need a vector file with all the separate components. I already have one of a World map, but didn't have one for the states of USA. But I had a bit of luck. I downloaded a nice png file displaying the empty states of the USA in pastel shades. I then copied it into Photoshop and using the magic wand tool was able to erase the black boundary lines between the states. I then saved the file and loaded it into Illustrator where I was able to convert the image into a vector containing each state as a separate image. It took a little over 5 minutes. I've made a start on my challenge and you can click on Texas and the adjoining states. Very simple concept - but this map can have many other uses.
http://benchmark-learning.com/USA/story_html5.html