You want to become a good presenter? Then there is one must read in the internet www.presentationzen.com. If you want to get some really good advice, stop by there every couple of days.
Today I found another very insightful comment at Seth Godins blog:
1. Respect (from the audience)
2. Love (to the audience)
There are certainly important evolutionary reasons why this is true. In my experience, every great presenter earns the respect of the audience (through her/his appearance, reputation, posture, voice, slides, introduction, etc.) and captures the attention of the audience by sending them love.
Have fun reading the whole article.