Karolina Lindqvist has updated their unofficial KDE 3.1 RC2 repository for Debian GNU/Linux 3.0 (Woody) again.
The KDE3.1 version is NOT the same as the version that will go to debian unstable. This version is compiled with the old standard g++ version 2.95 compiler. Some applications compiled with KDE3.0 might work together this KDE3.1.
To install kde3.1 with apt-get, put the following line in /etc/apt/sources.list:
deb ftp://wh9.tu-dresden.de/kde3/karolina ./