Cook's Illustrated came up with a great idea involving a dish cloth.
1. Place the cake pan on top of a large kitchen towel and top with an inverted plate.
2. Gather each corner of the towel and hold the ends together on the bottom of the plate. Gripping the towel tightly in one hand, lift the cake and the plate together.
3. Place your other hand on te bottom and gently invert the cake pan and plate onto the countertop. Lift off the pan to release the cake.