Ultrabooks are one of the big stories here at CES 2012. Thin, lightweight laptops with impressive performance are all the rage at this year's show, with companies announcing them at an alarming rate. We expect the flood of ultrabook announcements to continue throughout the show, so we thought we'd round them all up in one place for you. Take a look right here at our Ultrabook stream, and keep checking back as we'll be updating it constantly over the next few days.