You could just email the file to yourself and viola! your presentation is now on your iPad!How are you going to connect the iPad to your iMac? There's no mini-display port. Am I missing something? With the optional VGA adpater you can connect the iPad to a projector but I see no way to connect the iPad to the Mac and use the iPad as a projector.
Young Turk
To the OP: I remain skeptical about how useful the iWork and all that will be on the iPad. I'm not ruling it out yet and will probably buy at least one of the three to mess around with. I guess we'll all know in a week!