On April 1, 2010, Marcia Hofmann of the EFF gave a talk on the Freedom of Information Act (FOIA). She covered the basics of what it is, how to file one, and what the legal implications and ramifications of the process are. Her talk was very insightful and cleared up a lot of common misconceptions people have about the process.
Attached are the presentation she gave, as well as a sample FOIA request if you want to file your own. Video of the talk is forthcoming.
Also, feel free to peruse the EFF FAQ on FOIA for more information: http://www.eff.org/issues/bloggers/legal/journalists/foia