UGSS (Microsoft's User Group Support Services) have just published a video series that I recorded last year on How To Give Great Presentations. This free series of 8 videos covers the following subjects:-

1. Introduction (6 minutes 23 seconds)
2. Choosing The Right Presentation (8 minutes 30 seconds)
3. How To Explain Absolutely Anything (8 minutes 51 seconds)
4. Planning Your Presentation (22 minutes 52 seconds)
5. Nervousness And How To Overcome It (13 minutes 7 seconds)
6. How To Give Great Demos (26 minutes 9 seconds)
7. Preparing Your Laptop (19 minutes 21 seconds)
8. Presenting Your Presentation (35 minutes 39 seconds)

If you're new to presenting and feel that the leap is a bit daunting this video series will help you. It is aimed at first timers but experienced presenters will also find tips and tricks to help hone existing presentation skills. The series is also accompanied by a paper that you can download at http://www.guysmithferrier.com/Downloads/HowToGiveGreatPresentations.pdf.