Copyright protection is pretty much automatic and there is no need to actually post it. Speaking as a writer, however, many people seem to think anything on the internet is common property. So a polite blurb wouldn't hurt. I think Gail has something on her site, and a few others as well. My site is currently down, but I did have a little thing on mine.

My advice, don't make it sound desperate or like you're shouting at people.