I was wondering if anybody taught the traditional computer courses in
ruby.

With a google search, I found Dr Cripps at mtsu using Rails (not clear
if he is using something else as well) to teach programming theory,  Dr
Lewis at Duke using ruby and rails to teach web application
development, Tinkham and Kaner at Olin university using ruby in a
course on software testing. A few using ruby as a 4th or 5th language
briefly mentioned.

Does anyone know of any college course?

If this sample is representative of the thousands of universities
offering their syllabus on line, does that mean that ruby has not
penetrated the fortress of universities/colleges? Is it a matter of
time, or are universities conservative, and they can only teach the
language most used, ie C++ and Java for a while yet.