However, I haven't yet seen -- and this DOES NOT MEAN it doesn't exits -- anyone pointing out that two of the nominees are presently only available for website viewing. Girl Genius, Volume 8: Agatha Heterodyne and the Chapel of Bones and Schlock Mercenary: The Body Politic are both series of webcomics, and are not yet published on paper. The Girl Genius title will be published in May, but I'm not sure how long it will be before the Schlock Mercenary title gets into print.
I know that there has been an extensive effort over the last couple of years to make sure that the Hugo categories are explicitly inclusive of electronic (i.e. web) publication, and this outcome also supports this.