Oh dear --I don't think the previous poster has USED YAST to install software on beta 8 --It DOESN'T WORK on beta 8.
There's a new package manager for installing software now -- I can't get it to work yet and there's almost no documentation but this will improve I'm sure as we get nearer Release candidates (RC1, RC2 etc) and the 10.1 final.
Currently on Beta 8 install manually with the rpm command from a console.
Anyway what you do is first get the win32 codecs
the daily XINE build can be got from here
http://cambuca.ldhs.cetuc.puc-rio.br/xine/
Download win32codecs, libdvdcss , libxine and, xine-ui.
change to the directory you downloaded them in and then switch to a console and type in this command for each package.
rpm -Uvh packagename.rpm
should work
If you install all these DVD playing should work fine -- you can use kaffeine as well without having to re-install it as it will pick up libdvdcss and the this (unhobbled) version of XINE with the libraries.
YAST was the OLD method of installing software. There's a new package manager in beta 8 -- I can't make it work and there's not much documentation around but I suspect that will all change as we get nearer the Release Final (or even RC1).
Cheers
-K