McGill switched to 'Desire2Learn' last summer as Blackboard no longer supports 'webCT', I think (access to old courses hosted on webCT is now very limited). 'myCourses' was the branding chosen by McGill... I think now they just call it 'myCourses2', after the switch.
Hm... how come Desire2Learn hasn't been sued by Blackboard yet? Usually, as soon as a uni stops switches away to use a competing course management software, the competitor get sued based on the LMS patent:
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...