procmail recipe to remove list-name from subject

[Greg Norris <haphazard@kc.rr.com>]

Anyone have a procmail recipe you'd be willing to share, for sanitizing
mailing-list subjects?  Basically, I'd like to take

   Re: Re: Re: [list-name] blah blah

and turn it into 

   Re: blah blah

I figure that I could come up with something workable using sed and
formail, but was hoping that someone else has already done the heavy
lifting. ;-)