Pucon, Chile, and Western Argentina will have stuff. I don't know how much creeking there is in the Fu Valley as most of the tribs are rainfed and unreliable. The Michimiouida (sp?) near Chaiten is a go, though. Not South America But Southern Mexico/Costa Rica/Panama also have goods (though I believe the main season for this is a little earlier). Don't specifically know the Ecuador season but I know plenty of people who've gone in December and January and had a blast.
"The world would be a better place if everyone kayaked."-Brad Ludden (Valhalla)
"You only get one chance to run a drop blind."-DD