And I am also wondering about how some shots are ok for the web (like these ones here, which, if I was so inclined I could save and then put on hundreds of websites) but others will never hit the internet. How do you manage that in your contracts?
I've set myself up with three different "identities".
1. Contract/freelance work.
2. Commissioned work (portraits, weddings, families, some model portfolio work, etc.)
3. Gallery/non-commissioned work.
#1 should be obvious and #2 is basically someone asking me to shoot for him/her/them. #3 is where I choose what to shoot, how to shoot it, and then market it to local art shops, galleries, stock agencies, whatever. Of those, there are two types I market: the unlimited images where you may see them just about anywhere (once on the 'net, you pretty much lose control of image distribution) and the limited editions.
My limited editions never see the Internet. Ever. Some may be close but it's not the same image. I don't even e-mail them to my printer. I drive them down on CD/USB drive. I show them in proof books, in person, or by shipping books wherever.
These were all during my own projects. No contracts involved aside from model releases.