Here are some use cases for Syndicated Images:

• News Images – news organizations have hundreds of thousands professional photographers around the world.  As news happens, bloggers will talk about them and photos taken by the photographers will help spice up those posts.  Throw in millions of amateur photographers and you got enough chaos to drive major market shifting events.
• Porn Images – porn businesses and enthusiasts (?!?) joins the blogspace.  Replace all those free thumbnail websites causing popup hell with image syndication.  Keep track of your favorite porn stars by subscribing to their image feed.
• Space Images – NASA and observatories can syndicate images taken by all those fancy telescopes for consumption by space enthusiasts.
• Style Images – designers and clothing industry can distribute images of latest design and fashion.  Wanna keep track of latest in bikini?  Kiss my RSS.
• TV Images – keep track of your favorite TV shows by subscribing to image feeds of memorable moments, upcoming episodes, and behind-the-stage images.
• Food Images – we got zillions of restaurants, cooks, moms, and food enthusiasts.  When they talk about food in their blogs, they will want pictures.  I want a picture of Kimchee!
• Talent Images – actors, models, talent agencies can provide feeds of their latest portfolio and clients.
• Destination Images – what better way to publicize your hole in the wall tourist spot than with syndicated images?  Hand your bellboy a digital camera and feed images of incoming guests.  Oops, she is not your wife, monsieur?

I could go on and on, but I gotta make a living.