Jetstream 1GB 256kbit $40
Phoneline $40 (?)
Mob Data Connection $50
Call Minder $10
Total = $140
So.... if you already use mobile data (to the tune of around fifty bucks or more), and have basic j/s, a homeline & call minder, you could dump it all in favour of a 3G card at $149 for a GB. Your speed will be about the same, you will be totally mobile too.
(But you will be unable to use Skype)
So its doable right now, on Vodafone, and maybe Telecom soon if they match price.
I would be keen to do it if my employer didnt pay my entire phone bill.