From the Census Bureau: The U.S. Census Bureau today released the 2006-2008 ACS PUMS files. The 2006-2008 ACS 3-year Public Use Microdata Sample (PUMS) files provide population and housing unit responses from a sample of individual ACS questionnaires collected during the January 2006 through December 2008 period.
These microdata allow ACS data users to look at relationships among variables not shown in the standard data products published by the Census Bureau and provide greater accessibility to data for research projects. In particular, researchers and data users have found the PUMS data useful for regression analysis, modeling applications, and designing tabulations to create custom ACS population and housing characteristics data.
The 2006-2008 ACS 3-year PUMS data can be accessed on American FactFinder or by using DataFerrett
The Minnesota Population Center's IPUMS project will release their version of the 2006-2008 ACS PUMS files later this year.