eye contact
to keep audiences' attention (Asian audience might feel aggressed.)
facial expressions should be natural and friendly:
raise eyebrows to show surprise -
open eyes wide -
squint your eyes -
curl your eyebrows

the hands
Lots of possibilities to emphasise, to enumerate.
to express sincerity or reflexion
Be conscious of what you do with your hands
If you are unhappy, hold notes or cards to occupy them
arm - movements back and forth to suggest flow.
Open arms to include or welcome ideas

body movement
to indicate a change of focus
keep audience's attention
move forward to emphasize
move to side to indicate a transition gesture
up and down head motions are movements to indicate importance or acknowledgement
pen or pointer to indicate part, place (on a transparency)
shrug shoulder to indicate I don't know or care

posture
stand straight but relaxed
(do not slouch or lean sideways)
Lean forward to emphasize however
No hands in pockets