Only code by the very best people (Abelson & Sussman, Norvig, PG, Armstrong, Marlow, Odersky) is worth reading. Common crap found on blogs (especially about Haskell or Lisp) or github (especially PHP and Ruby code) does only damage by giving a very wrong impression of what programming is really.
There is a good hint: read the standard library of "extraordinary" programming languages - Lisp, Smalltalk, Haskell, Erlang, Scala and, sigh.. Clojure)
But the very same law holds for any art, be it poetry or music composition, or fiction - 95% is just stuff, a mediocre crap.
btw, ''The Mythical Man-Month'' has no code in it.) And the first two chapters of ''The Programmers Stone'' (which are the only worth reading) has no code in it also.