Jensen Harris has published some Developer Resources for Office 2007 RTM. Harris notes these resources will eventually be available on MSDN but you can get them now via his blog. The first post has links for the Control ID list (in Excel format) and the CustomUI schema. Thanks to TheServerSide.NET for the link.
Harris is Group Program Manager of the Microsoft Office User Experience Team. Another valuable resource I noted on his site is The Office 2007 UI Bible, an organized list of links to his various posts on the why's and wherefore's of the Office 2007 user interface. Looks like good reading.
Tags: Office 2007, Jensen Harris, TheServerSide.NET