Tech42: I can't speak for Word, but the manual for Gnumeric (available at the link below) says it reads and writes to XLS format. Can I confirm this? Not yet, but it will be one of the first apps I download once Buy.Com gets off their butts and ships my N800 (ordered 4 days ago and still not shipped). Here's hoping it works.

http://www.gnome.org/projects/gnumeric/