The things you learn from students! Alexander Fleming's 1945 Nobel Prize acceptance speech, where he discusses early experiments in penicillin, is available online. (I would guess by going to the nobel.se site, you might be able to find directions to speeches by other laureates).

This was from a paper she wrote on the development of penicillin for my general biology class.

Update: the Nobel museum site is VERY cool (if you're a science-head). Another neat online paper is Maurice Wilkins' paper on the molecular configuration of nucleic acids