OpenOffice released RC1 this past week. I uninstalled OpenOffice Beta 2 on Suse 10 beta 3 and installed RC1 in its place. RC1 has been running like a champ. The biggest change between the beta version that came with S10B3 seems to be much better performance. It seems to start faster and the applications seem to run faster once started. I use Write, Calc, and Impress (the equivalent to Microsoft's Word, Excel, and Power Point). All three seem quite stable and I'm able to create and share documents between their Office equivalents. I even have the ability to save out to PDF (File | Export to PDF). Nice.
I can't say that OpenOffice would replace Microsoft Office for everyone. But for what I need, I really believe it can for both Linux and Windows.