2008 Blog Post (PingSpider) on history of social bookmarking
From EdTechTeacher, Teaching History With Technology. List of resources
GREAT graphic on laptop vs. pencil for note taking
GREAT description of how social bookmarking works (uses Delicious as a demo)
From The Scout Report -- September 17, 1999. Go to number 19, itList for description. itList, the first social bookmarking service