Every week I'll post my most popular picture on Shutterstock. Their new algorithm is actually pretty cool because it takes into account the number of download and the time the picture has been available. This make the most popular result very dynamic across the weeks.
Canon 17-40mm L - 17mm - f7.1 - 1/500s
This picture was taken at 33,000 feet from a business trip between Dallas and San-Francisco, and was my most popular for about a week.