XBMC is a fantastic and free cross-platform media center application we're nuts for. If you've wanted start using it or just wanted to customize the XBMC installation you're already running, this guide will walk you through everything, from installation to total customization.
We've featured quite a few XBMC tips, tricks, and guides here at Lifehacker. We're quite fond of it, and with good reason: It's attractive, powerful, and highly customizable. In fact, nearly everyone at Lifehacker has a copy installed somewhere—and I have XBMC networked and running on every television and computer in my house.