Hypertext history – check the .pdf link below for the annotated copy of “As We May Think”
The Doug Engelbart Foundation's 1995 Vannevar Bush Symposium video archive page includes a section on Bush's influence on Doug's work, including his copy of Bush's As We May Think with Doug's 1962 notes in the margins (pdf). Talk about deeply intertwingled living history. Per a note in the .pdf, the original hardcopy has apparently been donated to the Computer History Museum. Look for this paper when the Computer History Museum's Revolution - The First 2000 Years of Computing exhibit opens in Mountain View CA - and online on 13 Jan 2011.