deb http://dev.infonet.dk/debian <distribution> .

The debian repository consists of four distributions:

• Stable, this is the distribution to use for normal use. It will always target the current debian stable version.
• Testing*, when approaching a new release of debian this will contain the packages to be used for this release, it is generally not maintained until debian is in a "close to freeze" stage.
• Unstable, before packages are going to be stable it will have some time (still to be decided) in this distribution, and after testing by the developers it will become the new stable release and be uploaded to the stable distribution. This may be one package before the stable release, or smaller incremental releases, these smaller incremental releases will never work their way to stable, but only serve to help developers test the software. The version numbers for these smaller increments are in the form <last-stable-release>.<number> where number start at 1 and is incremented for each new incremental release.
• Experimental, which is built each night from the source code, only developers should use this.

This provides a release cycle a bit different from debian's. Instead of letting packages traverse from unstable to testing to stable they transition directly from unstable to stable. This is because we still want to provide upgrades for stable even though the debian stable distribution does only provide security upgrades.

For more information on the debian release model see http://www.debian.org/releases/