NeoOffice is a OS X port of OppenOffice.org by a group of developers who have thought from the beginning that the Main OO.o team was taking the wrong tack in offering X-11 support on the Mac.
Aqua-native, includes both PPC and Intel binaries, allows Spotlight to index both content and metadata of OpenOffice and OpenDocument files.
Importantly, NeoOffice v2.1 arrives on March 27th, and it will immediately include support for Microsoft Office 2007 document formats.