9/24/2010 - The September 2010 Cumulative Updates have been released.  This update includes the fix for Response Groups.  You can download the updates here: http://support.microsoft.com/kb/968802

From Next Hop:

Due to recent discoveries in the July 2010 Cumulative Update for Office Communications Server 2007 R2, it is necessary to remove this update from the download site until it can be patched. The primary concern is an issue with the Response Group Service. When the cumulative update is applied, changes in agents and agent groups are not applied until after the Response Group Service is restarted.

More information is available at the following locations (and will be updated):