I found some good info at this link:
http://forums.whirlpool.net.au/forum...fm/808806.html
The fifth post down is by a guy who claims to have this working and provides the steps that he used.
It looks like there is a virgin-provided program which will cause the dongle to register as a USB modem, which can then be used to connect with pppd just like any other modem. Apparently, it also defines a separate USB serial device that can be used for SMS and other "3G-specific" data-type requests . . . but, for internet access, this guy's post should suffice.
I wish I could test it, but I have no way to. I hope that works.