To unpack the .tgz file, you should be able to type:
tar -zxvf arduino-0009-linux.tgz
in a terminal. I'm afraid I don't know much about SuSe, though, so I can't offer much specific advice, but hopefully someone here knows more than I do.
Okay, now I have the unpacked files. Thanks, but I don't know what to do next. What file do I have to use ? I tried several files, but no Arduino program ............... >:(