The AEA is attempting to make another part of the job market thick: it is linked from the main JOE page at http://www.aeaweb.org/joe/
Here is the direct link.
Available Retired Faculty Listing: "As an experiment, the AEA is initiating a listing of retired economists who may be interested in teaching on either a part-time or temporary basis. Individuals can add or delete their name at any time during the year. The listing will be active from February 1 through November 30 each year. Listings will be deleted on November 30; the service will be closed during December and January, re-opening on February 1."
Right now the list is waiting to be populated by retired faculty seeking part time or temporary work.