[emidln]

You can do this, albeit slightly less reliably, in the US as well. The geolocation isn't perfect, but you could easily put "With delivery to XXXXX [edit]" where XXXXX is a zip code you geolocate off an ip (or lookup in a user profile for a recurring user).

[kstrauser]

The zip code is not fine grained enough to identify tax jurisdictions in many places in the US.