What copyright is needed for blogs or online publishing?

My husband is wanting to put some of his book he has been working on online in either his blog or perhaps on his myspace and website. However, there is a concern of people ripping it off. So what type of copyright will he need to have inplace on it for online purposes. Any advice, input, or guidance is appreciated.

http://www.copyright.gov/
http://www.copyright.gov/circs/circ1.html