Suse comes without mp3/dvd support because of legal reasons. THIS IS MAYBE THE 1000th post about the same topic.
First of all the suse 10.1 is ALPHA VERSION
. I would use it for only testing, because it just isn't stable.
Secondly you will need to add YAST repositories to add a mp3-functionality to the system or you can download the MAD-packages manually.
This thing is still in aplha/beta stage, so there maybe isn't any repositories to add.
You could also try SMART (apt) , although i don't know has it got any 10.1 packages on the list.
SUSE MAD PACKAGES needed for enabling mp3 support in XMMS/AMAROK on suse10:
Notice that suse10.1 comes with kde 3.5
Since there is no 10.1 repos yet, try the 10.0 repos
For multimedia, this is all you need : http://packman.iu-bremen.de/suse/10.0/