Sprint today launched the Novatel Ovation U720. The U720 is the first USB modem to support EV-DO Rev A in the United States. The U720 is also compatible with both Mac OS X and Windows (though currently only Windows XP/2000 support is listed by Sprint).
While not pictured, the unit includes a flip-up antenna for maximum reception. The Ovation U720 is available for $49.99 after rebate with new two-year agreement, $249.99 without contract.