I've always liked coffee cake, but I've never tried making it. I follow David Lebovitz's blog, and he made this recently, adapted from a cookbook he liked. You can find the recipe here.
YUM. It was good stuff. My family went nuts for it.
There's a thick layer of topping. Delicious. I was worried that the topping seemed too wet when I was putting it on the cake batter, but it turned out great. The cake tasted much better the next day, too.
Not that it wasn't good the night I made it...but it was fantastic the next day. This is definitely a keeper.