KnowledgeBase
This is still in beta phase and only available on edge.launchpad.net (beta testing). If you run into bugs, talk to the people in #launchpad on irc.freenode.net. (Known limitations)
Infrastructure
Launchpad Help - Get general help about Launchpad.
Code into Launchpad - Get your Code into Launchpad.
Getting Code into Launchpad - Upload a Branch into Launchpad.
Importing Code from somewhere else - Import your code into Launchpad.
Using a Personal Package Archive - Using a Personal Package Archive.
Community Infrastructure
DailyBuilds/NamingConventions - How to sanely name daily builds so users can easily find your software.
Adopt-an-Upstream program - Ubuntu users and developers who particularly care about one upstream project.
Packaging
The Ubuntu Packaging Guide - Learn how to package software.
The Debian Policy - The number one resource on packaging questions.
Building
User Documentation
Going Back to the old version again - Rolling packages back.