This article, although from 2008, is still one of the most comprehensive and succinctly written posts on copyright, privacy, disclosure, and other legal issues that affect bloggers. Really any website is subject to the same laws, but because of the nature of blogs - with content coming from not only the original site author, but the readers and members - it's especially important to be aware.
12 Important U.S. Laws Every Blogger Needs to Know
It's a long read but it touches on the twelve most important legal issues and explains why it's a blogger's concern, what the law is/says, and how to ensure compliance. The article looks at issues including: paid posts, linking laws (who knew there was such a thing?!), copyright issues for images/thumbnails, stolen content, domain name ownership/trademark issues, handling your readers' data, who owns user-driven content, blog comment liability, etc.