[dspillett]

It isn't used on any official forms and such that I'm aware of, at least outside technical circles, but people don't tend to have a problem with YMD ordered formats when they are used.

[Etheryte]

Sweden used YYYY-MM-DD before ISO 8601 was even written, and many other countries use it too.

[dspillett]

I know at least some countries further East used it as a matter of course, but I wasn't aware any countries in/near Europe did.