directNIC.com (the company I work for) has a small crew who are, in fact, holed up in exactly that situation, trying to keep our services online for the over one million domains registered here. They’ve even started a blog which is providing more REAL and realistic information than even the local news at this point (it’s being constantly referenced on CNN). You can read the blog here;

http://www.livejournal.com/users/interdictor/

Very cool guys. Just don’t get shot by looters. Anyone who’s considering purchasing a domain should put a lot of thought into the dedication these guys are showing in keeping everything alive and well.