Sign the online petition for Apple to support the OpenDocument Format.
Apple has received many requests the last two years to support the OpenDocument Format (ISO/IEC 26300) through its BugReporter. However, each request is hidden from other users. Since, many other vendors have been able to implement OpenDocument during the same time period, the time has come to take the dialog to a pulic forum. The petition refers to all relevant Apple products, but specificially mentions iWorks by name.
Might also be time to make a similar request for Ogg Vorbis in the iPod / iTunes pair.