Also of interest is the "Harvard Dialect Survey" [1], which gives direct questions and highlights the regional variances. My favorite is "standing on line" vs "standing in line" -- I had never even heard the "on line" variant until I moved to NYC, where it is ubiquitous.
Apparently now there's the "THE CAMBRIDGE ONLINE SURVEY OF WORLD ENGLISHES" [2], apparently by the same individual, but I've only just started looking at it.
Normal Irn Bru is just made from sugar and rust (OK, ammonium ferric citrate if you're being picky) so it doesn't taste like ginger.
I do recall there being a "spicy" variant a few years ago that did taste a bit like ginger but, as I can't stand Irn Bru at the best of times, I don't recall the details.
Source: married to a Scot that basically lives off the stuff. Bit surprised she isn't magnetic.
For a very long time, I thought "ginger" was something used in England for the most part instead of the US. I don't know where they say it regularly in the US, though. I'm now curious too.
I don't know if it is what the other poster is talking about but Michigan is weird in that a relatively large number of people drink ginger ale as a soft drink, particularly Vernors.
Just for the record to prevent any potential confusion: we Michiganders don't call pop "ginger". We do like our ginger ale though (particularly Vernors, but Canada Dry isn't bad).
Apparently now there's the "THE CAMBRIDGE ONLINE SURVEY OF WORLD ENGLISHES" [2], apparently by the same individual, but I've only just started looking at it.
[1] http://dialect.redlog.net/maps.html
[2] http://www.tekstlab.uio.no/cambridge_survey/