Correction to my earlier email:  2005-2009 ACS Block Group data WILL be released on December 14.

From: brian.mckenzie@census.gov [mailto:brian.mckenzie@census.gov]

Good Afternoon Mara and Elaine,
The summary file data (block group level data) will be available on December 14th. You can use American Factfinder as a portal. You will be able to download summary file data via the FTP website at <http://www2.census.gov/acs2009_5yr/summaryfile/>. There will also be a clickable link next to the familiar portion of AFF in which you select the desired ACS year(s) for which you would like data. Hope this helps.

Brian McKenzie
Analyst, Journey to Work and Migration Statistics Branch
U.S. Census Bureau
301-763-6532
brian.mckenzie@census.gov