Sprint is prepping the Sierra Wireless 598U and it should be shipping on 1/11/20009.

The 598U is the next generation USB Mobile Broadband device. The 598U has the following features:

• Vista, XP, Mac OS X Compatibility
• Small Size 0.9 X 3.1 X 0.44 inches, 7 ounces
  
• Antenna Port

The Sprint 598U also supports GPS and installs Sprint SmartView automaticall (without CD).