From the webpage:
OpenfMRI.org is a project dedicated to the free and open sharing of functional magnetic resonance imaging (fMRI) datasets, including raw data.
Now that’s a data set you don’t see everyday!
Not to mention being one that would be ripe to link into medical literature, hospital/physician records, etc.
First seen in Christophe Lalanne’s Bag of Tweets for March, 2012.