If you haven't seen The Thrilling Adventures of Lovelace and Babbage, a Steampunk AU webcomic about the pioneers of computing, you are doing yourself a disservice if you do not follow that link. Artist/writer/researcher/all-round-brilliant Sydney Padua has landed a book deal with the exalted and discerning publisher Pantheon to put their adventures out in hard copy! I am very much looking forward to clutching the finished product in my hot little hands ...
In the meantime, there's an iPad App! I do not have an iPad myself, but have had the opportunity to play with this app, and it is the only thing to make me sort of think about wanting an iPad. There are annotations, and primary documents, and authentic original visual aides, enough to make a nerd's heart flutter.