ggplot map
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).