Here is a link to a wonderful ggplot2 tutorial:
by R. Saccilotto and the Basel Institute for Clinical Epidemiology and Biostatistics. The tutorial uses some classic data sets to build up some spectacular graphics. It is a no-nonsense, easy-to-follow hands on tutorial.

If you are working throught the tutorial, check out the sample chapter of the ggplot2 book here. It looks like R. Saccilotto’s tutorial was based heavily on the ggplot2 book.