Blackboard Mobile Learn takes interactive teaching and learning mobile, giving students and teachers access to their courses, content and organizations on a variety of mobile devices, including Sprint Network Android and BlackBerry® phones and iPhone OS-powered devices via Wi-Fi. Students and instructors get access to all of the content available in the web interface, with the added ability to access documents in multiple formats, post announcements (instructors), create discussion threads and posts, and comment on blogs and journals (instructors), all on the mobile devices they love.
Announcements: Assignment due? Class cancelled? This is the place where instructors go to post the news students need to know. Students have instant, on-the-go access to the latest announcements, and instructors can post announcements anywhere, anytime.
Grades: Want to know how you did on the midterm or your last homework assignment? Students can view their grades right here.
Blogs: Read blog posts and interact with classmates by posting comments on their blogs or responding to comments on your own.
Roster: Wondering who’s in your class? With the class roster, you can quickly see your full class list, making organizing study groups a whole lot easier.
Discussions: The Discussion Board is a key course communication tool for engaging students and promoting learning. It’s the place students ask and answer questions, and where instructors can respond to one student for the benefit of all. With Blackboard Mobile Learn, instructors and students can review and post to threaded discussions, as well as create new threads, all while on the go.
Journals: Students can access music, videos and images uploaded by their instructors and experience directly from their mobile devices using the appropriate media-specific software.
Tasks: Help students track and manage the progress of various tasks, from turning in homework assignments to reminders to pick up a midterm or purchase a textbook. Tasks allow students to mark when they’ve started a project, when it’s in progress, and when complete.
Media: Students can access music, videos and images uploaded by their instructors and experience directly from their mobile devices using the appropriate software specific to the media type.

Source: http://www.blackboard.com/Mobile/Mobile-Learn/Device-Demos.aspx