Image maps are a way in HTML to let one image link to several pages depending on where in the image you clicked. I wrote a program that makes client side image maps easy. You can draw on the picture, specify the URLs, and it will output the HTML code. It's pretty useful.
Watch it work in this screencast!
Download from here, no installation needed, just unzip and run imapper.exe.
Source code is here, released under the GPLv3.