Robin Good: Presto is a system which allows you to author dynamic presentations for iPads. Presentations are created on the Mac with Presto Builder and then exported to your iPad for final delivery.
Presto presentations are non-linear and you can swipe and connect to other slides in multiple ways.
The final content created with Presto can also be shared with your Twitter and Facebook contacts.
The iPad app is free to download.
Presto Builder for the Mac is available inside the Mac App Store and costs: €4.99/$5.99
More info: http://www.presto-app.com/