it would be helpful if you could make the adding 1 click. i have to leave your site, then come back, then go to back to the other site and copy the next field..etc etc. no one is really going to do that.

you could do a combination of geolocation and screen scraping to do it (or maybe there is a better way, that's just the first thing that came to mind), and it would probably take a bit so you'd have to ask the user to wait or something.