wintermute000 posted the Aussie radio image in the fast boot thread.
http://dl.dropbox.com/u/8648738/NON-HLOS.bin
All that is needed is to flash that in fast boot with the following command: fastboot flash modem NON-HLOS.bin
Then insert the SIM and reboot and it should just work. You may need to select GSM/UMTS in Mobile Networks settings. The APN is set automatically by the SIM and the apns-config.XML by default has the necessary APNs included for ATT and T-Mobile.
We intend to post a more complete tutorial but are trying to understand more about how it works and what doesn't work under the AU radio.
P3Droid has VZW 4g data and CDMA1X voice but no 3g data. I have no service at all with VZW SIM because I am in a 3g only area.
It appears to break eHRPD authentication probably because that is not used on Australian networks and is a very problematic part of how VZW's network is deployed.
When we get it figured out a little better we will post more information.
Right now it's pretty straightforward. You use the AU radio for GSM/UMTS service but must flash back to the VZW radio for normal CDMA/LTE/EVDO service.