For those quoting "overseas" pricing, what is the tax included? (the US price is without tax). Would be a useful comparison this way.
Today I investigated Adobe's Australian store more closely, and discovered that if you choose the download rather than physical delivery, they can somehow avoid charging GST, so the price drops to $307, which is the same price as the CS4 to CS5 upgrade. This doesn't really weaken my complaint about price gouging however, because the price is still 54% more than in the US, and Adobe can no longer use tax as a partial justification. (In fact the download price would be 70 cents more than physical delivery if you added the tax back on.)
BTW, I noticed that the Australian site still has "Preorder" for CS6, but the US site has "Buy". They probably just forgot to change it.
To give Adobe some credit, I noticed that a full copy of Lightroom 4 can be downloaded for $187, a markup of about 25% over the US price of $149. I think this is bordering on reasonable, if we give Adobe the benefit of the doubt. You get 30% off Lightroom if you also buy a Photoshop CS6 upgrade, which comes to $437.90 for both programs.
It does seem strange that Adobe give a better deal on the cheaper product. You'd think it would make more sense to steer people towards the more expensive option. I guess their marketing people thought the Photoshop market is less price-sensitive.
I didn't research the deals in other countries for lack of time. It's easy enough for any interested person to do.