Thanks for writing us about this. If you purchase the ebook of MCTS Self-Paced Training Kit (Exam 70-643) from oreilly.com at http://shop.oreilly.com/product/0790145306401.do, you'll be able to download the CD content as well as three ebook formats. You can see which formats are available and that the CD Content is available by looking at the formats line below the Ebook buying option:
Formats: CD Content, ePub, Mobi, PDF
Hope that helps!