How do you measure your flour? That can make a real difference in the denseness of your baked goods. If it calls for sifted, sift; otherwise spoon and level.
Also, it depends on the type of cake like philg said. A carrot cake is always going to be dense, as opposed to angel food. I'm not sure I'd want to use whipped egg whites in a carrot cake...or even a pound cake for that matter.
If you really want it to rise, have you tried a stoneware pan? I always find my cakes are higher when I use my PC pans.
Lacey: So now that Superman is done at the Iron Fortress, is he going to spin his web of justice and return to the Batcave?
Brent: You don't read many comic books, do you?