A handout with some nuts-and-bolts advice on writing, which I use in a lecture in our "Research Skills" course for PhD students.
The transcript of a talk on permutation tests, with slide images, that I did for a mixed group of mostly dental researchers, so it should be quite accessible. (I hope I didn't say anything too stupid, if Phillip Good happens to read this.)
A one-page summary of sensitivity, specificity, positive predictive value, and negative predictive valule, which I find helpful given my defective memory.
John L. Adams's philosophy of statistical modeling in one slide containing a 3-bubble flow chart and 9 words total. This is tacked to the wall outside my office door.
Richard Feynman's "Cargo Cult Science". This is the 1974 CalTech commencement address, a slightly adapted version of which was the last chapter in Surely You're Joking, Mr. Feynman!
Martin A. Schwartz on "The importance of stupidity in scientific research", from the Journal of Cell Science (and he's serious).
David Foster Wallace on "the intellectualization and aestheticizing of principles and values", which "is one of the things that's gutted our generation".