UPDATE: The Gawker site has some fun with this.
ANOTHER: CHE also has a story, which points out that in October 2012, Mellen Press called on its authors to defend the publisher's reputation at various on-line fora. As opposed to suing critics, that seems like a quite sensible and constructive response! I'm still mystified, though, how the Press could think suing a librarian, and thus bringing the wrath of all the world's academic librarians down on you, was a smart strategy. I also think that a sensible public relations person would advise the Press to withdraw the suit and do a mea culpa, at the same time defending the quality of its catalogue against the criticisms. (There is apparently a separate libel suit by the individual who founded Mellen Press, Herbert Richardson, against the same librarian for a different set of comments about Mr. Ricahrdson's prior professional career. If, in fact, the statements in question are false, that separate suit might have merit.)
AND YET ANOTHER: This story has some bearing on Mr. Richardson's personal suit agains the librarian, and sugests the allegations there are also, alas, without merit.