A new update to iWork is providing some fixes to bugs (primarily with tables) in Keynote, Pages, and Numbers, but also provides a new export option that makes Pages documents compatible with iBooks.
The iWork 9.0.4 update is recommended for anyone using iWork 9.0 - 9.0.3. The fixes for Keynote include patching an issue that occurred when printing handouts with rule lines, resolving a problem with the slide switcher, and also fixes an issue when automatically resizing some images when changing the size of a slide.
Pages received the fix for tables, as well as the ePub export option. Numbers was impacted the least, with only the table fix being applied to the app.
The update is available via Software Update or can be downloaded from the Apple Support Downloads page. It's about 71.2 MB in size via Software Update. There's also a MacBook Pro EFI Firmware Update for mid-2010 15-inch and 17-inch models.
Thanks to Michael K. for the tip!