Here's a link for the WWAN update for Apple Mac OS support of the aircards listed below. The accompanying text is pulled straight from the Apple support website:
The WWAN Support Update v1.0 provides SW support for the following WWAN products:
Available on the Cingular network:
?Novatel Merlin XU870 ExpressCard (HSDPA)
Available on the Sprint network:
?Novatel Wireless Merlin EX720 Express Card (EVDO Rev. A)
?Novatel Wireless Ovation U720 USB Modem (USB Adapter, EVDO Rev. A)
Available on the Verizon network:
?Novatel XV620 ExpressCard (EVDO Rev. 0)
?Novatel V740 ExpressCard (EVDO Rev. A)
?Novatel Wireless Ovation U720 (USB Adapter, EVDO Rev. A)
The WWAN Support Update v1.0 provides SW support for the following WWAN products:
Available on the Cingular network:
?Novatel Merlin XU870 ExpressCard (HSDPA)
Available on the Sprint network:
?Novatel Wireless Merlin EX720 Express Card (EVDO Rev. A)
?Novatel Wireless Ovation U720 USB Modem (USB Adapter, EVDO Rev. A)
Available on the Verizon network:
?Novatel XV620 ExpressCard (EVDO Rev. 0)
?Novatel V740 ExpressCard (EVDO Rev. A)
?Novatel Wireless Ovation U720 (USB Adapter, EVDO Rev. A)