http://www.copyright.gov/onlinesp/list/e_agents.html
I don't see one for Edublogs, nor for Incsub which Edublogs is "a project of" according to the footer of their site. Unless they're listed under a different name, then they open themselves up to liability such as this story indicates. Had they been listed, Pearson would have had to deliver their DMCA notice to Edublogs' agent rather than ServerBeach's. Because they're not, ServerBeach is the one who must take action in order to be protected by the safe harbor provision and Edublogs is now the one legally responsible for any infringing content.
Short story shorter, if you publish any sort of community content you really need to spend the $105 and protect yourself by availing yourself of the safe harbor provisions of the DMCA:
http://www.copyright.gov/onlinesp/agent.pdf
See also: http://www.wired.com/threatlevel/2010/10/dmca-righthaven-loo...