removing ]['s (and contents) from mailing list mail

I seem to recall a recipe to remove the square brackets (and enclosed 
words) from the subject lines was discussed recently, but I cannot find 
the thread.
I think I have the sed expression, but don't know how to put that into 
a procmail recipe.
sed -e 's/\[.*\] //'

which would make "[Stupid crap] Real subject" into "Real Subject"

One problem I see already is that some lists append the [] crap to the 
subject.  On the other hand, I don't mind if it's at the end of the 
Subject, so I doubt I'll trouble to fix this.
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