Amazon offers public datasets at http://aws.amazon.com/publicdatasets/ http://aws.amazon.com/publicdatasets/ They include census data, as well as a dump of fre

Amazon offers public datasets at http://aws.amazon.com/publicdatasets/ http://aws.amazon.com/publicdatasets/ They include census data, as well as a dump of freebase's data (which mirrors things like wikipedia). They also have some genome data.