When I do talks for Sun events and where the material needs to be re-usable, I always use the NeoOffice version of OpenOffice.org, because then I can give people ODF (or PPT, or PDF, or just about anything else you can imagine). When I’m doing an outward-facing presentation and either I really really care about trying to move the needle with the audience, or I have my back to the wall time-wise, I use Keynote. It’s been a few busy travel-packed weeks, and I had speeches to make at JAX.de and the International PHP Conference, both audiences important, I thought, so they got Keynote presentations. Anyhow, my real purpose here is just to say that the Keynote authoring interface is just totally excellent, amazingly good; and I speak as a pretty expert user of both PowerPoint and OpenOffice.org. For my money, maybe the best app Apple ships.