You can get the plans for the jig from Norm's website.
Plans only, $10.95
Vid & measured drawing $24.95
http://www.newyankee.com/getproduct3.cgi?9905
It looked darned easy to make, but I can't remember how he did it, either.
Edit:
I found a picture of it on the wood butcher's site.
http://woodbutcher.net/images/normstools/louver-jig.htm
It's not pretty, but the best I could find. I wish I'd taped that episode.