I use gnumeric to view/edit Excel files and doc Reader to view Word files. You have to also install Antiword for doc Reader to work. It uses Antiword to convert MS Word files to pdf or unformatted text files. The text files can be viewed from within doc Reader.

I installed gnumeric, doc Reader, and Antiword in Diablo without any problems. The last I heard, Abiword on OS2008 was still quite buggy, but I haven't tried it.