This page lists the extent of short selling on the ASX200 (as a % of issued capital). Looks like it gets published daily: http://www.asx.com.au/data/shortsell.txt MYER is presently the most short-sold stock on the ASX.
That Myer position is pretty big. Before we reached the current price level for PMs you'd often see NCM in the 50s and even 60s.