I have JIRA v4.4.4#664-r167664 installed with Greenhopper. I can't find anywhere which version of Greenhopper I'm using. It doesn't seem to be listed on the Greenhopper Plugin page nor is it part of my license details. Since I'm using JIRA 4.4, am I also using Greenhopper 4.4?
You can find this via the Administration -> Plugins -> Manage Plugins page. Alternatively, scroll to the bottom of any GreenHopper page (under the Agile menu, for instance Planning Board) and you will see the GreenHopper version listed there: