1 - Know what you are saying, but don't be regimented. Be prepared to change it at a moment's notice.
2 - Speak slowly. It's REALLY, REALLY hard to understand. You might be speaking at what you THINK is your normal speed of speech, but it's usually too fast. Speak about HALF as fast as you think you normally speak.
3 - LOOK out at the audience occasionally. They don't really want to see the top of your head while you look at your material (see item 1)
4 - Show and speak confidently, but not in a monotone.

There are probably other tips, but that's all I can think of at 1AM