This is a new tool shared with us in the comments recently: it’s a piece of code that you can use to automatically convert course exports from Blackboard Learn to Moodle 1.9 backup files. We haven’t had a chance to try it yet but the original contributor did mention that it worked great: http://reteach.org. Reteach was created by Adam Zapletal (http://adamzap.com/).
To get the tool to work you’ll need some command line experience (which makes it more daunting perhaps for the less technically inclined…like me). There is, however, pretty good documentation available for anyone that wants to give it a go: http://reteach.org/documentation/. Have you tried Reteach.org out to convert your courses? Let us know your experience.