Looks a lot like my little task manager, t: http://stevelosh.com/projects/t/

You can integrate t with Mercurial through a shell alias:

    [alias]
    task = !python /path/to/t.py --task-dir `$HG root` --list tasks

I'm sure you can do something similar with git.

This will let you do stuff like:

    $ hg task Fix the data-eating bug.
    $ hg task
    e - Fix the data-eating bug.
    $ vim myproject.py
    ... fix the bug ...
    $ hg task -f e
    $ hg commit 'Fix the big data-eating bug.'