Great article Steef-Jan, you seem to have covered the most important parts. I'm really amazed that there were so many BizTalk administration related questions to the exam.
Lot of questions on WCF as well :-( Not really my cup of tea. Improving my knowledge right now :-)
Nice article, I am preparing too for Exam 70-595.
Good article, I would like to get this certificate on this year,
Try my best!