Currently, we enable the Blackboard
Collaborate tool in courses only upon request due to the complexity of its interface. However, with the upcoming implementation of the new UI, we are going to be opening up the tool to all courses system wide. The new UI is so much easier to understand and use, and I am confident that the adoption rate is going to drastically increase.
Currently, some instructors use it for virtual office hours, some use it for lecture capture and still others use it for remote lecturing back to their class when they are off campus. Some of our organizations use it for web conferencing as well. With the greater availability of the tool next semester, I figure the use cases will at least be the same but more likely new ideas for using it will come about.