KOffice, like most KDE applications, has the unique selling point that the same codebase can be compiled and run on various platforms. The latest KOffice alpha release has attracted extra attention since it ships Windows and Macintosh binaries. This naturally means a much larger audience will be able to try it out and kick the tires. Techworld has an article up where they give a good overview and plenty of screenshots. Have you already tried out a KOffice alpha release?