How the impact of tax will affect purchases? Since people might be reluctant to pay extra money for taxes (especially in this economy), will they then be discouraged to buy online, or will it be insignificant enough to not care? How about paying taxes and shipping?
Then they would probably have to put in a sub-system to verify the first. Like gait-recognition, or similar. Something the same software could process without human interaction. Then that probably would have a 1% fail rate.