I am passing along a recipe for Lemonade Cake which can be found with a click.
I don't know that I will ever make this recipe myself, but I pass it along because I had some at a birthday party and it was AWESOME. The woman who made it told us where to find the recipe on the King Arthur Flour web site.
I do not always have great luck with cakes--they take a certain amount of attention that I can not always bring to the task. I am thinking that getting cake flour (vs. all-purpose) and cake enhancer (what ever that might be) would make a difference. This was seriously good cake.