I work at Gloria Jeans
I realise it's past Tuesday when you asked the question but anyway...
The Irish Nut Creme has powder as well as syrup in it so surely that would constitute more calories than just syrup. You could get it flavoured just with the Irish Creme syrup instead which would give most of the taste but less calories. In fact just looked it up on Calorie King and although it doesn't have the exact numbers it looks like doing that would save you about 40 calories.
I always get a small skim mocha with half the chocolate. I'm trying to get rid of the chocolate altogether but it's a big step for me from having extra chocolate!