If two or more teams are tied on match points, the following tiebreakers apply:
£±¡ËThe winner of the match between the two teams (does not apply if more than two teams are tied);
£²¡ËDifference between points scored for and points scored against in all pool matches;
£³¡ËDifference between tries scored for and tries scored against in all its pool matches;
£´¡ËPoints scored in all its pool matches;
£µ¡ËMost tries scored in all pool matches;
£¶¡ËOfficial IRB World Rankings as of 3 October 2011.
http://en.wikipedia.org/wiki/2011_Rugby_World_Cup