I used http://underthefold.org/2011/06/13/exam-70-448-study-guide-part-1/ as my primary study reference. This (and the other 5 pages that are part of this study guide) have links to topics in various places such as MSDN for each of the topics that 70-448 is examining. I went through all of the links (and the related links in the web sites referred to in the study guide) and passed the exam.

As for 70-452, I did not find any study material directly relating to that exam. The books you refer to are definitely a good start.