I'd say that most of you protect the copyright on your photos, and many of you use "protective" language and labelling.
I myself make all of my photos available via Creative Commons. While this doesn't yield me "sales", it does yield publication. I typically get 4-5 images electronically published per week, and this has included such outlets as Wired Magazine, Atlantic Magazine, InformationWeek, and Wall Street Journal. My windmill pic is particularly hot, being used this week on the cover of a U.S. Environmental Protection Agency publication. Even a picture of my dusty behind walking into the Grand Canyon has found its way into travel brochures.
The bottom line is that there's a lot of need for publishable material, but most people don't want to or can't pay for it. I tag my photos so would-be publishers can find the right image.
One day maybe I'll do otherwise and keep the copyright so I can sell stuff. But if you don't care about making money on photos and just are happy seeing them used, consider changing the "permission" on the picture to Creative Commons.
Image of Lake Michigan from New Buffalo, Michigan with Diana+ medium format toycam. (Explore)