Native Mac OS X version of OpenOffice.org coming in 2008
This summer, the development team offered the first alpha of a native version of OpenOffice.org for OS X. In other words, there's a standalone installer and you the applications are themed to look like native Mac apps. But as with any alpha software, install at your own risk and expect many bugs. For example, you couldn't print documents at first. That might be a dealbreaker.
Now the team has announced that they plan to have a fully functional version working for OS X by the time OpenOffice.org 3.0 is released in September 2008. The new version will include support for Apple's Aqua interface.
Of course, if you can't wait that long, you might want to check out NeoOffice, an independently produced OS X port of OpenOffice.org.