The HDHomeRun dual network tuner from Elgato lets you watch or record TV on two computers simultaneously. Connect it to your home network and your existing TV antenna or cable hookup, and you can wirelessly stream different content to two computers. It works on PCs with the Windows Media Center. Macs will require the EyeTV 3 software, which is included with the HDHomeRun. With a Mac and the EyeTV 3 software, you can even stream live or recorded TV to your iPhone, iPod touch, or iPad; this feature is not available with Windows PCs. It’s available for $179.95 at the Elgato online store, at B&H Photo, Amazon, and the Apple Store.