General
The RoadMap
Tips for ContributingChanges
The old ToDo list and MissingFeatures
OptionNaming - the conventions used to name command-line options
WritingTests - how to add tests to the test suite
DeveloperRepos - where to find various public repositories of Mercurial work
NewFeatureDiscussions - A page of links to discussions about new features.
NewIdeas - Suggestions for features/extensions that would make someone happy
First Mercurial UserSurvey.
Ideas for Google's SummerOfCode2006.
Mercurial Internals
- ["Design"] - Mercurial's data structures and how it uses them.
WhatGoesWhere - the project architecture
WireProtocol - the push/pull changegroup protocol
DebuggingFeatures - how to poke around in Mercurial's internals
- ["Theming"] - how to create new styles for Mercurial's web interface