Print question: If/when you have a photo of yours printed, do you have a watermark, "signature" or other identifier included? If so, how do you handle it so that it is as unobtrusive as possible while still identifying you as the photographer? Placement? Size? Degree of opaqueness? Etc?
I'm not sure if this is what you're talking about, but when I ordered from Snap Fish they placed some exif data on the back of the photo, like date, file name and all that. I'm not sure if you can customize it though.
Although art style in general is probably more obvious.
(But I don't.)
And I find it ironic that I've never seen a photo of Olan Mills.
I personally find watermarks annoying, I see them as a form of advertising. Put your info in the EXIF, watermarks have no legal value anyway. Your image is yours regardless.
I like the idea because it adds a personal touch to your print whereas a computer generated watermark is basically like a rubber stamp. Perhaps something to look into.
If you are displaying your work on a secure system like Zenfolio the only way they can get it off is by photographing the screen.