A few years ago I wrote a paper on "How To Give Great Presentations". Most of the information in this document is relatively timeless and so it needs little updating. I have uploaded an updated copy now which contains a few updates for more recent technologies referenced in the document as well as a few additional sections. The majority of the document is unchanged (it increased from 25 pages to 28 pages) but if you use it as a reference then you should download the updated copy.