You like the idea of saving bandwidth and want to try Deltup? Most likely you want to use the Dynamic Deltup Server. Here's how:
If you are running Gentoo, try reading the Gentoo WIKI
Everyone else should see this page
Click here to download Deltup/Bdelta
The latest, bleeding edge versions of Deltup and BDelta can be accessed via anonymous SVN at svn://deltup.org/deltup and svn://deltup.org/bdelta, respectively.