Andreas Schwab <schwab@suse.de>:
> > I have a little script called "editcomment" that does this.
> 
> How is that different from git commit --amend?

It works on any revision, not just the current branch tip.  But it 
invalidates all the downsttream hashes.  Copy enclosed for your inspection.
-- 
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>