Hey, let's check out some popular games on Australian Steam. 

Please remember all Steam prices, no matter where you are, are in USD. The US Steam prices (to the best of my knowledge or my ability to remember to switch stores) are in [square brackets]. 

Call of Duty®: Modern Warfare® 2 - $89.99 [$59.99]
Sid Meier's Civilization® V (Preorder) - $79.99 [$49.99]
Mass Effect 2 Digital Deluxe Edition - $79.99 [$59.99]
Borderlands - $79.99 [$29.99]
Dragon Age: Origins, Digital Deluxe Edition - $79.99 [$39.99]
Metro 2033 - $79.99 [$49.99]
Battlefield: Bad Company™ 2 - $69.99 [$49.99]
Boring Old regular Mass Effect 2 without bells/whistles - $69.99 [$39.99]
Blur - $64.99 [$39.99]

Oh, and that old classic, CoD4:MW is $49.99 [$29.99], which is a lot better than the $99.95AUD Xbox Live's Games on Demand is asking for. (US Live's G-on-D seems to be $39.99USD) 

Hope none of you missed that awesome Steam sale. Maybe one day they'll make a stand against publishers/retailers again. We can only hope.