Levitt's Abortion "Disappeared" When "Programming" Error Fixed
Christopher L. Foote and Christopher F. Goetz's paper can be found here. Personally, I think calling this a "programming oversight" is being much too nice (See my post here to see an example of what you would have to miss to not notice whether you have used fixed effects). More importantly everyone who works with panel data knows that you use fixed effects.
My own work concentrated on murder rates, but I also included fixed effects. Donohue and Levitt never provided us with all their data or their regressions and would never answer any questions that we had so I just assumed that they had included fixed effects from the beginning. It would have been nice if they had provided us with this same information years ago.
My paper with John Whitley is available here.
A letter that I had in the WSJ is available here.
James Q. Wilson's review of this debate is available here.
See also Steve Sailer's past work on this topic.
See also Steve Sailer's compliation of what others are saying here.
UPDATE II (I have been asked about inaccurate claims regarding my own research in More Guns, Less Crime):
See this for a discussion about claimed errors in More Guns, Less Crime