There are an ever-growing number of “experts” out here in fantasyland and a new segment of ranking-the-rankers type outlets cropping up. The FF Librarian, however, is heading into her fourth season of holding the pros’ opinions against them.

Sara Holladay, the aforementioned Fantasy Football Librarian — collaborating with Donnie Campbell of TheMostCredible.com and Bill Green of FantasyDispute.com — has announced the opening of Season 4 of her Accuracy Challenge and the third to be affiliated with the Fantasy Sports Trade Association.

As part of this challenge, anyone with an online fantasy football outlet and published rankings and/or projections can submit for judgment, with the results announced at the FSTA’s winter conference as well as reported via FFLibrarian.com and The New York Times‘ Fifth Down blog.

Rankings and projections are due before 8:30 p.m. Eastern Sept. 9, which is the approximate time for kickoff of the season-opening Saints-Vikings game (as if you didn’t know). Late submissions will be accepted, as long as the organizers can verify that the lists were published before the first game.

Entrants must submit rankings for their top 25 quarterbacks, 50 running backs, 50 wide receivers and 20 tight ends in Excel format. The template for projections submissions can be downloaded via the FSTA website.

Past overall winners included CBSSports.com in 2009, Fantazzle.com in 2008 and Ask the Commish in 2007, (under what appeared to be a different scoring format).

Rankings entries should go to [email protected].

Projections entries should be sent to [email protected], [email protected], [email protected] and [email protected].