I don’t know if this has already been posted but today’s MS Office Suite newsletter included a link to a 6 month old document about compatibility between Office 2007 and earlier versions.
The document said that the Compatibility pack and Office 2007 were still in beta.
Not true anymore.
You can get the compatiblity pack from http://www.microsoft.com/downloads/details.aspx?familyid=941b3470-3ae9-4aee-8f43-c6bb74cd1466&displaylang=en