"Predatory publishers are those that unprofessionally abuse the gold Open Access model of scholarly publishing. That is to say, they set up their operations mainly to attract the article processing fees that authors are required to pay under the gold OA model. The authors then become their main customers (not the readers), and the business is set up to attract authors and the fees they pay." ~ Jeffrey Beall
New York Times article, April 8, 2013 Scientific Articles Accepted (Personal Checks, Too)
Article in Nature Sept. 12, 2012 Predatory Publishers are Corrupting Open Access
Beall's List: Potential, possible, or probable predatory scholarly open access publishers
Specific steps to take and criteria to consider when evaluating a scholarly journal.
"Predatory Open Access Journals: Academics Beware". Presentation by Anne-Wil Harzing (2012).