Actually, fotolia has been the best site for me because of the extended license sales. Fotolia gives me the highest earning per download rate. What I've earned on fotolia is almost double compared to the other sites. Just last months, I had two extended license sales (10 dollars each). That's a lot of istock downloads... But again, that depends on your images. i also find their review rate to be the fastest and my credit section is also pretty cool. As someone has already mentioned, most of my sales also come from Europe (especially france, germany, and spain). I shoot primarily travel photos... and they are purchased by travel agencies and tour operators, I guess for their brochures and websites. Congratulations with your sale and good luck with fotolia.