The 10% off through autoclubs deal has been going for a while now, although the extra has changed to a free gift card - either Myer or Coles Express (Shell). Expires April 30. I would take the Coles Express one because fuel cards are as good as cash :-)
You can also get the 3g 8GB for 53.10 on a $59 cap and still get the bonus gift card.
You do need to enter your auto club membership number (RAA etc) but according to whirlpool there isn't really any checking - the numbers are 8 digits.
This is for online orders only.
Not a bad deal, probably the best you can get with Voda right now. 3 are doing the 3GS 32GB for $49 + $10/m though, not sure how their cap and data allowance compares but that's the next model up for $3 less p/m. I guess if you live in a rural area and can't use the 3G towers it's no good but those within 3's zones should definitely look at their deal.
EDIT: So Voda give you 500MB/m and 3 give you 250MB/m. Extra 500MB with 3 is $6/m so it works out well anyway.