Books on Effective Communication for Scientists
Dazzle 'em with Style: the Art of Oral Scientific Presentation. Robert R.H. Anholt. New York: W.H. Freeman and Co., c1994. Main Library [T 10.5 .A63 1994]
Preparing Scientific Illustrations: a Guide to Better Posters, Presentations, and Publications, 2nd edition. Mary Helen Briscoe. New York: Springer, c1996. Main Library [T 11.8 .B75 1996]
Scientific Papers and Presentations, revised edition. Martha Davis. Burlington, Mass.: Academic Press, c2005. Main Library [T 11 .D32 2005]
The Visual Display of Quantitative Information. Edward R. Tufte. Cheshire, Connecticut: Graphics Press, c1983. Main Library [QA 276.3 .T83]
"Better Posters" - a blog with great ideas on poster design, from @DoctorZen
"Make Award Winning Posters" - another site with great tips, from AstroWright.