I got this recipe from http://www.landolakes.com/, and it was awesome! It doesn't even taste gluten free.
2 cups sugar
1 cup butter, melted
4 teaspoons gluten-free vanilla
3 cups Gluten-Free Flour Blend (see below)
2 teaspoons gluten-free baking powder
1 cup milk
Heat oven to 350°F. Combine sugar and melted butter in large bowl. Beat at medium speed, scraping bowl often, until creamy. Add eggs, one at a time, beating well after each addition. Add vanilla; beat until well mixed.
Stir together flour blend and baking powder in small bowl. Gradually add flour mixture alternately with milk to butter mixture, beating at low speed until well mixed. Pour batter into greased and floured 12-cup bundt or 10-inch angel food cake (tube) pan (or two loaf pans). Bake for 50 to 60 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes; remove from pan.
Gluten-Free Flour Blend:
2 cups rice flour
2/3 cup potato starch
1/3 cup tapioca flour
1 teaspoon xanthan gum
Store in container with tight-fitting lid; stir before using.