whats the point of the green address if its not 100% instant?
I dont think reducing transaction time from 60 minutes to 20 minutes or whatever is gonna be much of a difference (also why things like solidcoin isnt a good solution)
It doesn't change the transaction time - it just means the receiver can trust the transaction at zero confirmations.
If all the exchanges used this, it would mean that the prices should stop lagging the mt.gox price.