Marshall University has put together some charts on the differences in Blackboard 8 and Blackboard 9.
Video tutorials on using Blackboard 9 are available through the Blackboard On Demand Learning Center, and all sorts of promotional videos on the joys of Blackboard are available through BlackboardTV on YouTube. More information is available through the Talk to Bb site. You can also request a 30 day trial preview of the latest release of Blackboard (which I am in the process of doing right now).
Meanwhile, here’s a nice little video introduction to Blackboard 9.1 from mamabutton on YouTube.