DIY home-theater PC builders have waited a long time for a product like Ceton’s InfiniTV 4. Drop one of these cards in your machine, insert the multi-stream CableCARD you acquired from your digital cable–TV service provider, and use Windows Media Center (Vista or Windows 7) to watch high-definition TV and record as many as four simultaneous high-definition streams—including encrypted premium content such as HBO and Showtime. Boom! Your PC is now a four-tuner DVR cum media server, and you can dump your service-provider’s lousy set-top box.Installing the InfiniTV was a snap. We inserted the card into an open PCI Express slot, slid our Comcast-provided multi-stream CableCARD into the InifiniTV’s PCMCIA socket (which remains exposed on your PC’s backplane), and connected our coaxial cable. If you purchase an InfiniTV 4, be sure that your cable provider gives you a multi-stream CableCARD, because that’s the only way to access all four content streams. If for whatever reason you ever need to swap out CableCARDs down the road, you can do so without cracking the case.