This office suite offers true compatibility across multiple platforms, running on Windows, Linux, and Mac OS X. In fact, version 3.0 is the first version that finally offers native support for Mac OS X (previous versions required X11 to run on the Mac).
More importantly, this suite also offers file compatibility with the latest Office 2007 file formats (such as .docx) along with the newest Open Document Format (ODF) file standards. In addition, you can directly export files to PDF format as well although it cannot read or write to the native file formats of iWork.
Where Office 2008 and iWork fall short is that both suites only offer a word processor, spreadsheet, and presentation program (while Office 2008 also offers Entourage as an e-mail client and organizer). In contrast, this suite offers a word processor, spreadsheet, presentation program, vector drawing program, and a relational database.