Nick, I know you're right on this one, James (my son) has also had various photos half inched for various publications, usually done out of desperation (no offense) for images, of a past event... and taking the hit, if, and when it gets discovered by the Photographer... just part of every day at work for them, they know they've done it, but its business as usual
I took some photo's of James Kiteboarding a few years back, the shop that he was sponsored by, just took the images, and put them straight onto a promotional leaflet.. pissed me off a bit, so I know how you feel...
Thom