1. Obsolete GNOME-related Git tips
1.1. git & bugzilla
Owen wrote a nifty tool called git-bz. See Owen's post about it. Note that the syntax has changed since that post, so you'll want to read the documentation at the top of the script file.
With this tool, you can attach patches to bugs, create bugs with patches, apply patches from bugs, etc. The header of the script contains all the information about it.
Update: bugzilla has been replaced by GitLab with a merge request workflow.
1.2. Linking to Git commits within this wiki
Use the following syntax:
<<GnomeGit(project, commitid)>>
Example
<<GnomeGit(libsocialweb,6ade9695cc5076e8bd97dd18f1c9cf7b5dbfafa3)>>
Will be shown as: commit 6ade96 in libsocialweb
Update: doesn't work for GitLab.