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The short answer is: There isn't one, exactly.
Now for the long answer....
Many of the tools that were in the 2003 Office Resource Kit have been incorporated into the 2007 Office system. We made other tools freely available in the Microsoft Office Download Center.
All of our documentation is available online in the Microsoft Office Desktop Applications TechCenter on TechNet. We also offer our content in Downloadable Books.
If you are deploying the 2007 Office system, it would be a good idea to go to our TechCenter and browse around for awhile. Try clicking the tabs on the top menu. Our site also has a cool new feature called "eyebrows." That's right. They look like breadcrumbs (the line of links just below the top menu), but if you mouse over on any of them, they show a dropdown list of other useful links.
Here's the tour
So come to our site and poke around for awhile. If you're not able to find what you're looking for, let us know!