I also like Tufte's modifications of boxplots which let you do small multiples comparison much more easily because they are very "thin" horizontally and don't clutter up the plot with redundant ink. However, it works best with a fairly large number of categories; if you've only got a few on a plot the regular (Tukey) boxplots look better since they have a bit more heft to them.
library(lattice)
library(taRifx)
compareplot(~weight | Diet * Time * Chick,
data.frame=cw ,
main = "Chick Weights",
box.show.mean=FALSE,
box.show.whiskers=FALSE,
box.show.box=FALSE
)
Other ways of making these (including the other kind of Tufte boxplot) are discussed in this question.
