A while ago I blogged about a my wish to see a particular feature in PowerPoint. Specifically I wanted to be able to ink on the image of a slide in presenter view and have the ink annotations displayed on the projected slideshow.
The reason? Presenter view is the best way to present from a tablet. Not only can you see the current slides, the notes and the timeline all in one view but the navigation controls are really easy to operate with a stylus. The bad news is that in the current version presenter view and ink annotations on slides are mutually exclusive. You can only use ink annotations if you are running in 'duplicate screens' mode and this is harder to control with a stylus.
The good news. It's in Office 12!

The screenshot above shows the slide view on the left 2/3 of the screen (on a monitor running 1280x1024 landscape. The right third or so is the presenter view on the tablet screen, running at 768x1024. In other words you see the latter, but the former is what is projected.
In PowerPoint 12 you can ink on the little thumbnail of the current slide in presenter view and these annotations show up on the projected show. You can make the thumbnail bigger by either using landscape mode or dragging the divider between the thumbnail and the notes to the right.