This cooling rack is quite possibly the best $20 I have ever spent. It allows you to stack and cool four half sheet trays worth of whatever you like. It's sturdy, easy to clean, and it folds flat for storage. In a home kitchen with limited space it is indispensable, especially if you like to bake. Of course it also puts your cooling cakes and cookies at eye level for any stray cats wandering around, but every gadget has a glitch or two. We bought ours about a month ago and it has gotten a serious workout. It just makes my life a little bit easier.
(Photograph from the King Arthur website.)