Attorney General Guidance
Aside from statutory amendments, few items impact the implementation of the FOIA more than attorney general guidance. Issued by the head of the Department of Justice, the memorandum is often used to air the presiding president's general feelings toward the FOIA, as well as offer a legal interpretation of the statute. Some represent a sea change in government attitude toward access and transparency (e.g. Janet Reno's 1993 missive), while others offer technical observations on appropriate implementation (e.g. John Ashcroft's 2001 memorandum). Most often they are released at the beginning of a new presidential administration, signaling a new direction in FOIA, or as an expository complement to legislative change. Below is a messy, but complete list of attorney general guidance.
Annual Reports
As part of an on-going project, I have collected FOIA annual reports for cabinet-level executive department from the first year of their issue until present. From 1998 and after, most are available online (easiest via DOJ/OIP), but in deference to propriety and ease-of-access, I will include all of the annual reports I have acquired. Many of the documents were received - somewhat ironically - from individual FOIA requests to the departments. Most annual reports prior 1998 were collected in a Indiana University-sponsored trip to the National Archives in Washington D.C. At last count, I have 610 of the approximately 647 thought to have been produced (the exact number is squishy because some departments merge or split or manifest or disappear).
Due to space constraints, I am unable to post all of the annual reports. If you are interested in any cabinet-level annual reports from 1975 through present, I would be happy to supply them.
If you are interested in the dataset of extracted information from the annual reports (as an Excel document or csv file) for research or journalistic pursuits, you can find it here.