You need to add to your /etc/apt/sources.list file one of these lines (according to your debian release) :
For stable:
deb http://debian.tryphon.org stable main contrib deb-src http://debian.tryphon.org stable main contrib
For testing:
deb http://debian.tryphon.org testing main contrib deb-src http://debian.tryphon.org testing main contrib
For unstable:
deb http://debian.tryphon.org unstable main contrib deb-src http://debian.tryphon.org unstable main contrib
For hardy:
deb http://debian.tryphon.org hardy main contrib deb-src http://debian.tryphon.org hardy main contrib
For intrepid:
deb http://debian.tryphon.org intrepid main contrib deb-src http://debian.tryphon.org intrepid main contrib
For jaunty:
deb http://debian.tryphon.org jaunty main contrib deb-src http://debian.tryphon.org jaunty main contrib
For karmic:
deb http://debian.tryphon.org karmic main contrib deb-src http://debian.tryphon.org karmic main contrib
For experimental:
deb http://debian.tryphon.org experimental main contrib deb-src http://debian.tryphon.org experimental main contrib
For woody:
deb http://debian.tryphon.org woody main contrib deb-src http://debian.tryphon.org woody main contrib
For sarge:
deb http://debian.tryphon.org sarge main contrib deb-src http://debian.tryphon.org sarge main contrib
The repository is signed with the Tryphon Debian Packagers key (Key fingerprint = FE49 DB75 D82D 6E92 B8E3 6112 D080 CEF3 C6AD BBD5).
To use this key in your apt client :
wget -q -O - http://debian.tryphon.org/release.asc | sudo apt-key add -