Download Ubuntu Packaging Guide (PDF, Epub, HTML In A Single .deb)

Daniel Holbach maintains a daily builds PPA for a project called "Ubuntu Packaging Guide" which aims to provide a set of articles for working with debian packages and Launchpad, uploading your GPG key to Launchpad (required to create a PPA), fixing bugs, getting the code via BZR, working with a PPA and so on. The guide is in its early stages (currently version 0.1.0) so it's not complete but it's already quite useful.