I hate to see people doing it, as SEOBook points out, but it’s happening more and more.

Look at this:

SeoBook points out that this is smart marketing:

I did a search on the same phrase and saw someone was putting thier URL in a top ranked image. Pretty smart marketing there, and no doubt one of the cheapest ways to tap into popular culture.

I bet eventually many non profit groups and others sites which have significant authority and limited funds will start making their voice heard in the search results far more, especially on image searches, where they may put the names of people they feel caused problems (and/or other messages) on horrific images of piss poor humanity in action.

I haven’t done much on the image optimization front, but there can only be a limited number of factors for images:

• file name
• image alt text
• image title
• image age
• click streams
• trust of site image is on
• links referencing the image

This would be the "metrics" part, but I doubt people who put their urls next to a sexy Paris Hilton photo care about any of that.