Creative Commons provides free tools that let authors, scientists, artists, and educators easily mark their creative work with the freedoms they want it to carry. You can use CC to change your copyright terms from "All Rights Reserved" to "Some Rights Reserved."
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I haven't tried it but I hear (and read) good things about it. I don't know much about online copyright and how rights and usage in the real world translate to the interwebtubes but this could prove helpful to someone.
For me it's interesting because I'm seriously considering releasing a novel I've been working on online in it's entirety so maybe a Creative Commons "Some Rights Reserved" license is just what I'd need.