Just observe a few simple rules and you too can improve -
- Know your content!
- Get early wins with your audience.
- Have a laugh! Don't be so serious or nervous
- Stay on track.
Powerpoint is an excellent tool for producing eye catching graphics and creating slides that people enjoy. This website is a library of excellent powerpoint slide shows - http://www.slideshare.net/.Some can be downloaded, but the main point is to draw inspiration from other people's work to enable you to be creative also.