Thank you all very much for the help. I will think about it.
But the next time I will have a little more time for experimenting will be around christmas, so for the time now I guess I will rather take a smaller harddisk (around 200 GB), format it to ext3 and convert my library to mp3, so the NSLU will not have to do any transcoding anymore.
I will still be able to play my flac files over the PC anytime if I need sound quality.
bye
Wolfgang