I was recommended to take a look at Cameron Moll’s tips, so I did, and found them extremely practical.
http://cameronmoll.com/archives/2009/02/20_tips_better_conference_speaking/
This led on to reading some from Edward Tufte (he of The Visual Display of Quantitative Information fame)
http://www.cs.umd.edu/class/spring2002/cmsc434-0101/MUIseum/applications/presentationtips.html
