Public speaking and giving presentations is becoming more and more important in many career paths. There are nervous public speakers, confident public speakers, and many people who are making the journey from one to the other. But ALL of them could do with avoiding breaking just the most basic rules of presenting - it's amazing how often one or more of these will crop up at a conference, training day or event. I hope this is taken in the spirit it is intended. :)
Read all the guides I've ever written (to Prezi, Twitter, Public Speaking, Evernote, Netvibes, etc etc) linked from one page.