Karolina Lindqvist has released an unofficial KDE 3.1 RC2 for Debian GNU/Linux 3.0 (Woody)
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.Read more
To install kde3.1 with apt-get, put the following line in /etc/apt/sources.list:
deb http://shakti.ath.cx/debian/kde3.1 ./