Those who read too much
The term was coined in 1957 by H.L. Mencken (a year after he died), who said "There are people who read too much: the bibliobibuli". - wiktionary.com
I found this word on a list of fun words over here.
Dictionary.com doesn't list this word, and it can't be found on Merriam-Webster.com , but I did a google search and came up with several hits, most notably a publisher and a fanfiction site for Harry Potter! I find it to be a very interesting word, and wonder that it's not in the dictionary. Odd. Seems like that would be right up Webster's alley...