The link for the 70-403 Exam Preperation Guide in the Beta Announcment is incorrect. The correct link is http://www.microsoft.com/learning/en/us/exams/70-403.aspx. In the process of updating our sites the extensions for prep guides are changing from .mspx to .aspx. So if one is not working please try the other.
Sorry for any delay or confusion.
Thanks,
Jim