30 minutes before preparing the cake, combine dried blueberries and sherry in a wide, shallow bowl; allow berries to soften and rehydrate for 30 to 60 minutes.
Drain blueberries, reserving any liquid. Set aside blueberries and liquid.
Heat the oven to 350°F. Generously grease and flour a 10-inch scalloped or plain tube pan. In a medium bowl, combine the flour, cornmeal, baking powder, baking soda, and salt.
In the bowl of an electric mixer beat butter and sugar until light and fluffy. Add eggs; beat until well combined.
Add flour mixture to butter mixture alternately with buttermilk and reserved liquid drained from berries; beat just until combined.
Fold blueberries, pecans, and orange rind into batter.
Spoon into prepared bundt pan.
Bake 45 to 50 minutes or until the cake tester inserted in the center comes out clean.
Cool the cake for 10 minutes.
Loosen the edge; invert the pan and unmold the cake to cool on a wire rack or cake platter. Sift 1 tablespoon of confectioners' sugar over the cake and serve.