[noste]

"I also recall a zombie novel, which was published in serial form online before being published in physical form. Quite good, as I remember. Might have been called Empire - the plot synopsis fits what I remember, but the online serial version doesn't seem to be available any more."

David Wellington (http://www.davidwellington.net/) has written a number of zombie novels that were first published in serialized form online and subsequently in print.