Oracle's decision to trigger a Linux turf war has thus far produced the exact results Larry Ellison desired. Red Hat investors freaked out, and Red Hat customers gained a new avenue for putting pricing pressure on their Linux supplier. Despite such concrete turns in the Linux market, Oracle's support plan continues to be more bluster than muster, according to Mark Shuttleworth, whose company Canonical oversees Ubuntu Linux.
http://www.regdeveloper.co.uk/2006/11/10/shuttleworth_oracle/