I would add a Terms of Service Page with several legal disclaimers. You can look here for idea of what I am talking about. I don't think you need one nearly as complex, but you should touch on some of the main issues. http://www.webmd.com/about_webmd/terms_conditions.htm
Hold the domain name in a different legal entity than the content copyright. Make sure you don't own any assets personally. You can't prevent yourself from being sued. You just make it expensive and difficult to get any money.
There's nothing you can do that will give you total protection. Hiding behind a corporate shell doesn't necessarily protect you from getting sued, though it may make it more difficult for someone to COLLECT. You'd still have to pay the lawyers and litigate.
Sorry for the double post--also, beware what state you incorporate your legal entity in. Every state has different rules on corporate liability, which you should check carefully before making any decisions. Make sure to look up the rules in the state where you live/do business, as those rules will likely apply to you as well (corporations can have _2_ "domiciles" unlike individuals: place of incorporation AND principal place of business)