Apple released Keynote 5.1.1, an update of the presentation software for Mac OS X. The update “addresses issues when working with large Keynote presentations on Mac OS X 10.7 (“Lion”).
It also adds accessibility and stability improvements. Keynote 5.1.1 requires Mac OS X 10.6.6 or higher. You can obtain the update via the Software Update component of the Mac OS X Systems Preferences app.
Keynote is part of the US$79 iWork suite. Or you can buy it at the Mac App Store for $19.99.