I wrote a tool that is capturing the changing images over time and saving them online. You can see the images at Tied the Leader's web server. I'll add more meta data to the page but I wanted to get something up quickly. For some background, I'm requesting each image, and when the 'ETag' http header changes, I'm grabbing an updated image and saving it to the servers. The default page is listing the images from oldest to newest at the moment.