I just ran across my very own image on top of someone's web page. It's the very same image I entered in last month's contest. Apparently it's been used as part of another, larger image.
You can see it here: Google Lunar X PRIZE
I suspect they likely lifted it from the NASA Astronomy Picture of the Day site, where the Copyright is plainly marked: APOD: 2006 September 7 - Colorful Moon Mosaic
I'd be proud to have my image at the top of the Lunar X Prize site, but they'll need to pay me for its use. I have licensed this image to be used a number of times, but notably not to them.
I wonder how I should approach this. Any suggestions?