You can use the same cooling rack to keep your home theater components cool, too. Just place a small cooling rack under each box or console on the shelf. They can be had for just a few bucks a piece, and come in so many sizes that you're sure to find one that fits your shelf and can hide under your components to maintain a clean look.
Cookie cooling racks also work great for those nights you want to watch a movie on your laptop in bed. Putting your laptop right on the covers is a sure way to get it to overheat, but placing a cooling rack underneath can help keep air circulating and keep your machine at a good temp. (Images: 1. Shutterstock, 2. composite [Idealo, iweb.cooking.com], 3. time2saveworkshops.com)