Posted earlier was the Three 1gb/month for $14.95 which is still the best for light users.
However, if you are looking for more download and you have an optus mobile phone already, Optus has just this morning released their new wireless internet plans of which the 5gb $40/month plan is the most attractive. This matches Vodafone's $40/month 5gb plan (and bettered three's 5gb plan).
See http://forums.whirlpool.net.au/forum-replies.cfm?t=853477&p=… for discussion as to the pros and cons of this offer.
Hi I've got the Voda plan. So I've noticed some finer points… which new customers should take into consideration:
1) Voda is actually $1 less at $39/month compared to Optus $40/month.
2) Also when you sign up with Voda for 24 months you own the modem/pc card outright. With Optus you don't and after 24 months is over you have to pay $5/month for the modem which I think is silly.
3) I think you have to bundle with an existing service for Optus. Voda you dont have to.
Other than that, I read on Whirlpool that Optus gives you 5 emails I think compared to Vodafone with just 1!