Any idea how much power built-in HSDPA will use?
No. But I sometimes use the WWAN and other times use Wi-Fi without noticing a difference in battery life.
Wouldn't tethering it to your phone via Bluetooth, as Keyone suggested, be a lot cheaper than built-in? I don't blame you for wanting it built-in; I'm surprised you just didn't buy an OQO with built-in hsdpa. There's more to it than the card. You need a slot to plug the card into, another slot for the sim card, and a pull-out antenna. You also need to install the drivers, the carrier connection manager, and the OQO Manager in that order.
I bought it second hand from someone that bought it for an project that never took off. These things are rare so i was lucky to have one. And not the 1.6 model that dies because of overheating. $500 is not much for an good OQO new in box.
I have OQO manager working fine in Win7 but if there is an order I have to uninstall it first if it will conflict.
There is indeed more to it than i originally thought.