Several weeks ago, we described how Keynote for the iPad suffers from formatting and other issues when sharing presentations with a Mac. No support for custom fonts, disappearing presenter notes, and trouble with screen ratios were some of the problems we encountered. As if they were listening, Apple has published a support document on Keynote for iPad best practices.
It's a nice overview. Apple suggests which theme to use (options include Black, Craft, Harmony and Parchment), the proper size (1024 x 768) and fonts available to both platforms. Fonts not available on the iPad will be replaced with Helvetica.
As for images, Apple recommends scaling them to their intended size before adding them to a slideshow (kind of a hassle), and sticking with the PNG format.
There are a few more tips listed, but we'll let you read for yourself. Hopefully these suggestions will improve the experience for those who wish to present from their iPads.