If your farm is still running 2007 products, you may want to have a look into these new cumulative updates. They must be installed on the farm that reaches the SP1 patch level or above.
Description of the Office SharePoint Server 2007 Cumulative Update Server Hotfix Package (MOSS server-package): June 29, 2010
Description of the Windows SharePoint Services 3.0 Cumulative Update Server Hotfix Package (WSS server-package): June 29, 2010
Description of the Project Server 2007 hotfix package (Pjsrvapp-x-none.msp; Pjsrvwfe-x-none.msp): June 29, 2010
You can read the description of each packages (click into the detail KBs) to find what they fixed. It is not necessary to apply them if you are not affected by those issues. For more information on how to apply updates, check Update Resource Center.