2008/12/5 Robert Rohde rarohde@gmail.com:
I have ~200 images on Commons, used in ~2000 wiki articles in various languages. Those image description pages contain a link to my website, and collectively those links generate about 2.5% of my incoming web traffic. An additional 1% of my traffic comes from just 2 links that occur directly in enwiki pages. So, I would conclude that reference links on Commons images are individually of low value compared to the external links in articles. And both are largely insignificant compared to the 75% of my traffic that originates from search engines.
But you cannot exclude that you are higher in search engines cause of links from Wikipedia articles and images ;)
AJF/WarX