For government meeting planners and those who have a large number of government-employed attendees: The General Services Administration has made some changes to its 2006 per diem rates. From the bulletin:
The General Services Administration (GSA) is changing the FY 2006 lodging per diem rates in the State of California, city of Oakland, including the county of Alameda; the State of Georgia, city of Savannah, including the county of Chatham; the State of Illinois, city of Chicago, including the counties of Cook and Lake; the State of New York, the boroughs of Manhattan, Brooklyn, Queens, the Bronx and Staten Island; the State of North Carolina, city of Charlotte, including the county of Mecklenburg; the State of Ohio, city of Cincinnati, including the counties of Hamilton and Clermont; the State of South Carolina, city of Aiken, including the county of Aiken, and the State of Washington, city of Tacoma, including the county of Pierce. Also, GSA has reviewed the meals and incidental expenses (M&IE) rate for Aiken, South Carolina.
You can download the specifics from here.