How to find the list of universities running a specific program?
The UK graduate schools are officially ranked through Research Assessment Exercise (being currently phased out to be replaced by Research Excellence Framework), so you can get a full list of programs that are of any worth here.

In the US, rankings are produced from time to time by the National Research Council. The most recent set is from 2009. The methodology and reporting format are beyond weird, but at least the list of programs is useful (albeit difficult to navigate in the Excel file format; I found my area, statistics, under "Physical sciences", for instance, which is a very distant shot). The 1995 rankings were done with involvement of real statisticians, so I trust them better.