The hottest new mobile devices - media tablets - are part of the ultra-mobile device (UMD) market that includes numerous innovations over the past four years, such as mobile Internet devices (MIDs), ultra-mobile PCs (UMPCs), and netbook computers. Each form-factor has been replacing itself with a radically different mobile computing concept every 24 months. One of the leading countries behind the UMD charge is the United States. This study analyzes trends for UMDs in the US. While quickly surpassing shipments of legacy MIDs and UMPCs, how long will it take before media tablets overtake netbooks? What distribution and sales channels are having the greatest impact and how will that trend change over time? What are the attach rates by operating system, applications processor, and connectivity?