Here is a list of tasks that need to be performed in order to migrate to Git. They are sorted by order of importance.

Phase 0: Absolutely required

• Collect a set of getting started docs to get people started. (No need to write our own, but a good list of references to prevent people from stumbling on more occult or outdated uses of Git)
• Codify a set of central repository guidelines (who gets to create new branches, tagging policy, no rewriting of history, etc).
• And implement these in a series of hooks
• Set up e-mail, CIA hooks
• Set up a mirror to github/gitorious
• Improve/check gitweb setup or move to cgit
• Write a plug-in for Trac to link to the gitweb/cgit changesets
• Update build-o-matic for Git

Phase 1: Equal functionality

• Improve TracGit (or homecooked plugin) for speed.

Phase 2: Icing on the cake

• Implement pulling and pushing patches to Trac
• Implement support for Git diffs in Trac