Actually one of my pet peeves is that websites continually update their copyright notices. I've always felt that's not how copyright should work. If you update a website, the copyright should take effect when the content, say an article, was first published. Just because the page gets served up in 2009 doesn't mean you get to slap a copyright 2009 on there if the article is from 2003.

Alas, I bet the lawyerly interpretation is that each downloaded HTML file is it's own licensed copy and perhaps copyright comes into being at the point of the successful HTTP request.