This page lists many of the books I recommend.
In the interests of full disclosure here, each of these images contains an affiliate link, so I do make a (small) amount of money if you click through and purchase. If you find that offensive, you can always go directly to the site in question and purchase direct.
RibbonX - Customizing the Office 2007 Ribbon
Naturally, I get to plug this one first, since it's mine! This is the definitive guide for customizing the Ribbon in Office 2007 (and higher):
I've always been a fan of John Walkenbach's books. I've found them very easy to read, and packed with information. To my mind, you can't go wrong with one of John's books. He's got a ton of them, so even if you need a different version, hop over to Amazon and look for the same title with a different version number.
If you love PivotTables, or want to know more about them, then you'll want to read:
And if you want to get into serious Excel development, this is the book for you:
Obviously there are a lot more books out there as well. Do you have any favourites? Post them in the comments!
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