The two day Stephen Hughes presentation skills workshop I attended five or so years ago is still the best piece of preaching training I have ever had. He gave many useful tips and techniques including, 'How to begin.' Me Map Grab desribes your first two minutes, or sometimes less, in a public speaking presentation.
Me. This is me; who I am, what I do, why I'm here.
Map. This is where we're going in the presentation.
Grab. This is why you should listen; why it's important.
If there are two of you doing the presentation then follow the more alliterative and Godstuff copyright mnemonic We Wot Why. Thing is, it can all go horribly wrong. Follow this link to the Ship of Fools website and rejoice you never grabbed people thus.