Show HN: I just hacked together an app to map broadband speeds.
speedmap.heroku.com
speedmap.heroku.com
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.
While the sample size is small, I'm surprised that the US is largely on par with Europe in terms of speed. I'd expect though that price / speed is much better in Europe.