Pandas Tutorial:
http://pandas.pydata.org/pandas-docs/stable/10min.html
[Run through it]
In [ ]:
A More involved example:
http://nbviewer.ipython.org/github/herrfz/dataanalysis/blob/master/week4/clustering_example.ipynb
(replace "%load_ext rmagic" with "%load_ext rpy2.ipython")
An 11-lesson tutorial: