This might be one for the front page of the site, but I'm not sure how to submit a link there?
Anyway this is an in depth history and survey of the buildings out at Orfordness. I wished I'd have read over this before I visited this summer as it serves as a pretty good guide for anyone taking the trip.
http://services.english-heritage.org.uk/ResearchReportsPdfs/010_2009WEB.pdf