Some tips on Oral presentations

After observing a few oral presentations by notable professors, I thought there are atleast two important aspects which display one's authority or profoundness in that partcular field:

1. Relate your current work (the small step you have taken) to the overall picture/broader objective of yours.

2. Acknowledge the importance of the other parts of the big picture that you probably haven't done. (This also shows that you know about it...and that you are humble! :-) )