After some googling i put up the best example of literate programming ever created (by Knuth himself) in an easily accessible PDF format.
TeX: The Program (2.2Mb), PDF format
You can build it by yourself like this:
% wget http://tug.org/texlive/devsrc/Build/source/texk/web2c/tex.web % weave tex.web % pdftex tex.tex