"The Least of my Brothers" (http://poynter.indiana.edu/sas/lb/) - This freely available online short course on research ethics from the Poynter Center for the Study of Ethics and American Institutions at Indiana University-Bloomington describes the famous PHS Syphilis Study at Tuskegee. "From 1932 to 1972, 399 poor black sharecroppers in Macon County, Alabama were denied treatment for syphilis and deceived by physicians of the United States Public Health Service. As part of the Tuskegee Syphilis Study, designed to document the natural history of the disease, these men were told that they were being treated for 'bad blood.' In fact, government officials went to extreme lengths to ensure that they received no therapy from any source. As reported by the New York Times on July 26, 1972, the Tuskegee Syphilis Study was revealed as 'the longest nontherapeutic experiment on human beings in medical history.'"
A blog on analyzing polling data (http://politicalarithmetik.blogspot.com/) - "Political arithmetik: Where numbers and politics meet" is a blog from Charles Franklin, a professor of political science, in which he explains political bias in polls, the statistical analysis of them, and more. Lots of good examples and very detailed analysis.