I am increasingly interested in designing documents for tablets. They could work great in one-on-one meetings (or even stand alone). I have not found the right platform to develop them yet though.
PDFs do not always work (especially when converted using the Microsoft Office plug in) and show up within the frame of the iPad PDF reader (menu bars, chart thumbnails).
HTML5 looks promising. Onswipe aims to be an HTML5 publishing platform for magazines that also could be useful for presentations. If you visit the Marie Claire web site on an iPad for example you see what it can do (it looks like an app, but it is a regular HTML page). But you also see the limitations. A browser-based environment makes page switching slow, and again, you still have the navigation frameworks of the browser application.
Custom apps. Over the past weeks, I taught myself Adobe InDesign, and loaded up software that can turn Adobe InDesign files into custom iPad apps. My computer science background is trying to convince me actually download the entire IOS 4.3 SDK to have a look inside to see what it takes to program an iPad app from scratch. It is a heavy-handed approach though.
Do you have experience with this? Let us know in the comments.