More instructors (and students) are using iPads to access Blackboard. Unfortunately, Safari, the iPad's default browser, interacts poorly with Bb; text windows found in Announcements and discussion boards are often inaccessible. There is a fix--Safari isn't the only Web browser avaialable. iLunascape is a free one. Read here and here for descriptions of others like Atomic and Grazing which offer features like tabs, VGA out and full screen viewing.
iLunascape is the only one that I have tested and it does appear to provide a better experience in Blackboard.