I bought the Uno from MakerShed.
Interestingly, we also go a MakeyMakey. When running the Arduino software and plugging in the MakeyMakey (makeymakey.com) two usb modem options appear n the Tools>Serial Port menu, /dev/tty.usbmodem1d11 and /dev/cu.usbmodem1d11. Both usbmodem options disappear when the makeymakey is removed.
The Arduino board itself is still not recognized though.