Curves (and Other Goodies) for Photoshop Elements – Photo Tips @ Earthbound Light: http://www.earthboundlight.com/phototips/photoshop-elements-curves.html
Wow. It does just workTM too. The downside being that I now have to go back and re-read all those PS CS articles with Curves in them that I skipped over the last year or so…
It ought to be worth it though.