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Preheat oven to 350 degrees F. Grease a bundt pan very well and lightly dust with flour. The cake can also be baked in 2 loaf pans or in a 9 inch springform pan if you prefer, just adjust the baking time accordingly.
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Cream together the sugar, cream cheese, butter and vanilla well.
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Add the eggs one at a time, beating well after each addition. Then add the lemon zest.
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Sift together the flour and baking powder.
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Gently fold dry ingredients into the creamed mixture until the flour is almost fully incorporated.
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At that point fold in the blueberries.
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Bake for about 1 hour or until toothpick inserted in center comes out clean. Baking times will vary considerably, especially if you are using frozen berries, which can add as much as 15-20 minutes. Watch it closely and rely on the toothpick test to make sure that it is completely baked.
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Cool on a wire rack for 15 minutes before turning out of the pan onto the rack to cool completely. Drizzle witht he glazes before serving.