I had it for the 1st time last fall at CSA. They were temporarily out of Ting at the repeaters dinner (they were going to get more) so I tried the Moscow Mule and it was one of my favorites the rest of the week!! It was available at all bars as well.
I just read this thread in my hammock at CSA and persuaded my Better Half to fetch a Dark and Stormy from the Sunset Bar just near us before they shut, so I could find out what it is. Oooh what a lovely drink - I'll certainly be trying that again.