Dear Garth-- I am going to answer and include the CTPP listserv.  Thanks for the timely query.
 
The release of data from the ACS is based on the population of the area, so you will not get "all counties" in Michigan at the same time. 
So, Counties with population greater than 250,000  have annual data (2003) already
available at:  http://factfinder.census.gov/servlet/DatasetMainPageServlet?_program=ACS&_lang=en&_ts=133099923308 These are from the Supplemental Survey component of the ACS during it's test phase.  The data from 2005 ("full implementation") should be available in mid-2006.
 
Counties with population over 65,000 will have data from 2005 released in 2006.
Counties with population over 20,000 will require a 3-year accumulation of data, so data from 2005/06/07 will be required, and will not be released until 2008. 
 
Anything with less than 20,000 population will require 5-years of data accumulation before release. 
 
Also, we have EXCELLENT news from the CB.  The CB has DRAFT tables for ACS including many relevant tables for transportation planners.  There are many "CTPP-like" tables by "Means of Transportation to Work" at both residence geography AND workplace geography (but not FLOW) as part of the standard tabulation package, particularly as compared to SF3 from Census 2000.   Phil Salopek of the CB will be sending these DRAFTs out to the CTPP listserv later this week.  They were distributed in paper copy at the TRB Planning Applications conference in Portland last week.    Phil expects this table structure to be used starting with the 2004 data (limited to large geographic areas). 
 
Elaine Murakami
FHWA Office of Planning
206-220-4460 (Seattle)

 -----Original Message-----
From: Garth Banninga [mailto:banningag@michigan.gov]
Sent: Monday, May 02, 2005 6:54 AM
To: Murakami, Elaine
Subject: County-level ACS

Hi Elaine:
 
Now that all counties are part of the ACS annual sample, when can I expect to see ACS data for all Michigan counties on the ACS's data tables links?
 
Thanks,
Garth Banninga, Planner
MDOT-Planning
517.335.2959