This is from the horses mouth. Release dates are kind of late for a lot of people who are already studying though.
TitleAuthor
MCTS Self-Paced Training Kit (Exam 70-642): Configuring Windows Server® 2008 Network Infrastructure (2nd Edition)Tony Northrup and J.C. Mackin
MCITP Self-Paced Training Kit (Exam 70-646): Windows Server® 2008 Administrator (2nd Edition)Orin Thomas and Ian McLean
MCTS Self-Paced Training Kit (Exam 70-643): Configuring Windows Server 2008 Applications Infrastructure, 2nd EdJ.C. Mackin
MCTS Self-Paced Training Kit (Exam 70-640): Configuring Windows Server® 2008 Active Directory® (2nd Edition)Dan Holme, Nelson Ruest, Danielle Ruest, Jason Kellington