load(url("http://dl.dropbox.com/u/61803503/nycounty.RData"))
head(ny); head(key)  #view the data set from my drop box
library(ggplot2)
ggplot(ny, aes(long, lat, group=group)) +  geom_polygon(colour='black', fill=NA)

#  Now how can we plot a pie chart of race on each county 
#  (sizing of the pie would also be controllable via a size 
#  parameter like other `geom_` functions).