This interesting set of maps is an example of how presentation can triumph over content. The pretty maps total to not a huge amount of information on dialect differences in the United States, a topic that has been posted about here on HN before, but their sheer prettiness prompted me to share the link to my Facebook wall, whereupon Facebook showed me on my home page that five of my other friends have already shared the same link. It's often easier for pretty pictures to go viral than more informative paragraphs of text.
The underlying survey that gathered the data
http://www4.uwm.edu/FLL/linguistics/dialect/
is, I think, something we have also discussed before here on HN. The link from the survey home page that is supposed to lead to the faculty webpage of the principal investigator appears to be a dead link. He is now at a new university,
http://www.mml.cam.ac.uk/dtal/staff/bv230/
still working on linguistics research.