The shelves are the Holman Entertaining Shelves from Pottery Barn. They're great. They're so heavy and sturdy. The house could implode and they'd still be hanging.
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I originally wanted to fill that entire nook with bottle shelves and glass shelves like in the photo below, but that would have been about $400.
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I had enough Chase Rewards points to purchase three wine glass shelves, so I cashed them in for the shelves and picked up this very affordable OMAR wine rack at Ikea for only $34.99:
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I guess that I could always add the nice wine shelves later. But I could also take that $225 and put it towards a trip to Napa to go drink wine!