No sooner am I starting to get used to the new version of the APA Style Manual (APA 6), but there are now so many errors and corrections that the American Psychological Association is offering TO REPLACE the first versions of APA 6! Not sure how many errors there were (sickenly ironic, being a style guide we are talking about) in this recently revised edition? Check out the Corrections to the First Printing of the Publication Manual (July 2009) of the American Psychological Association, Sixth Edition.
The Chronicle of Higher Education (sorry, subscription is required) and Inside Higher Education both reported extensively on these issues, in turn helping the APA to recognize that the extent of these problems really required the previously sold editions of APA 6 to be replaced.
Now, to re-learn the styles that were just relearned.