The October 2011 release of RGraph is now available and has new animation effects and other improvements including:
myPie = new RGraph.Pie('cvs', [4,3,5,6]);
myPie.Set('chart.colors', ['red','green','blue','pink']);
RGraph.Effects.Pie.Implode(myPie);
RGraph.Effects.Pie.RoundRobin(myPie);
Download RGraph here: RGraph_2011-10-27-stable.zip