Look at the people - in the eyes. Engage them. You are giving a message, information - to them.

Think of the information/message. You are just a channel for it. In other words, take yourself out of the picture.

They do care about you - and you care about this. You are giving them something that they need or want. Think outward - not inwards.

Hope this makes some kind of sense.

Here's a couple of links for info:
http://www.ehow.com/facts_4911372_wh...-speaking.html

http://www.myarticlearchive.com/articles/7/117.htm

(One suggests joining Toastmasters...there's an idea!)