Tom,

Your chart has a single dataset: "... Specify a color for each data
point within a single data set by separating the color parameters by
using the pipe character (|). This feature is available for bar
charts, pie charts, scatter plots and maps." (see the last paragraph
under Chart Colors @ http://code.google.com/apis/chart/colors.html#rgb)

Your data ranges between 49 and 1012, but charts using text encoding
look for data between 0 and 100 by default. You need to use Text
Encoding with Data Scaling (http://code.google.com/apis/chart/
formats.html#data_scaling) to let the API know how it should scale
your data. Try adding chds=0,1200

Regarding your data point labels, your CHM parameter is not complete
(you need to provide colour, dataset index, etc.) Try "chm=N*f0x*,
000000,0,-1,11" to start and reread 
http://code.google.com/apis/chart/labels.html#data_point_labels

Good luck,
K
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