Other institutions have created numerous tutorials and tip sheets. Following are links to some of the best available. (Please note that any references to account information, course setup, contacting the helpdesk, etc., on these pages refers to the originating institution, not to Hamilton College.)
Hudson Valley Community College has extensive tutorials for students, both PDF and video.
USC has produced several Blackboard Student How-to Movies for students (scroll down below the instructor videos).
Montclair State University has a nice set of Documentation and Videos for students.
Lakeland Community College has produced a five-minute Introduction to Blackboard 9 for students.
And don't forget the User's Manual, accessible from any course (via the Tools area).