I finally took exam 70-668 today and passed to give my two exams for MCITP.
I few tips to this exam as it was a lot different from what I expected.
Almost all the questions were based off a scenario. This meant you often had to switch between question and scenario to determine the answer. I think most of the answers that seemed hard came to make sense after reading it a few times. Several were more like trick questions. If you read it too fast you could easily pick the wrong answer.
There are 50 questions on 70-668