This is a tough one, because it's so "intangible". you can't count the issues printed...it's the web! and in the process of creating an html website the photo may even be downsized and occupy a small space on the webpage.
So how do you even start to figure out how much to charge someone who wants to use the photo on their COMPANY website? (this is a business/commercial site).
I really need some ideas - maybe some of you have soold photos for use on the web?