I passed the 70-486 last week. I was very thankful that I spent a lot of time learning about Windows Identity Foundation and the new Claims-Based authentication features.
The exam was not very hard. I have been working with MVC for more than a year now although only about 8 months seriously. I'll continue to update my study guide as I have time. Sorry I've not been able to get to that, I have been exceptionally busy right now.