If you have a Flick Pro account, check out the new Flickr stats. You have to activate it first but it only takes 10 minutes or so for it to generate your stats.
What surprised me was that my Pink Flowers photo was the most viewed image yesterday. It’s a nice photo but by digging into the stats I see that search engines sent 71% of the traffic. Just goes to show that you should set the title of your photos carefully!