This is just a passing comment, but further comments would be interesting.
I noticed that slepinio in the “Ultimate Christian name” thread said, “you little brat, come here already, dinner’s getting cold!” which seems to be what OED describes as US Jewish usage, an intensifier.
In the UK, already means by now, and in South African English “already” is commonly used as OED says, for emphasis, as in “We did it a month ago already”, which I assume is a direct translation of the Afrikaans usage of “al” meaning already. In the Caribbean, it apparently is also used for emphasis.
Does anyone here use “already” in any other sense, and if so, where?