Arduino Uno USB invisible to OS X

as posted on the forum:

Just got my Uno after finding semi-permanent projects for two previous Duemilanoves. Upgraded to Arduino 0020. After rebooting, and power cycling the Uno, there’s still no serial port for the Uno.

The board is noted under Linux, which reports an unknown device with ID 2341:0001. On my MacBook (10.6.4), System Profiler lists:
Code:

Communication Device:

  Product ID:	0x0001
  Vendor ID:	0x2341
  Version:	 0.00
  Speed:	Up to 12 Mb/sec
  Location ID:	0x24110000
  Current Available (mA):	500
  Current Required (mA):	Unknown (Device has not been configured) 

There are no /dev/tty* or /dev/cu* devices that correspond to the device.

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