I could be wrong, but on first glance at 
http://code.google.com/apis/chart/image/docs/gallery/bar_charts.html#bar_types 
the 
example for bvo is missing pipes between data sets:
chd=t:
  10,50,60,80,40
  50,60,100,40,20
  30,30,75,20,60

should be:
chd=t:
  10,50,60,80,40 |
  50,60,100,40,20 |
  30,30,75,20,60

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