My most-published picture is a picture of a juvenile loggerhead turtle being released into the wild just off of Palm Beach, Florida. It is commonly referred to as "[the screaming turtle](http://photos.echeng.com/gallery/3381454#189233567_EExXr)". According to Google, it is [being used online in about 21,200 locations](http://ech.cc/rvEVZi). One day, I will unleash an IP attorney to hunt down all unauthorized commercial use. I don't care about the personal use, as long as people attribute me and leave my watermark on the picture (which many do not).
Hint: to see where your pictures are used, go to Google Images and drag a JPG into the search field!