From today's Business Spectator: http://www.businessspectator.com.au/bs.nsf/Article/ASX-high-frequency-trading-HFT-markets-NYSE-pd20120411-T8S3V?OpenDocument&src=sph
One paragraph says "Stock exchanges the world over are now making a fortune from renting space in their data rooms to high-frequency computerised traders and would probably collapse without it (the ASX would not – yet)."
