Study Tips for the PSM I

I feel like we need a thread for the study tips for the PSM I.

So, here are some links that should help folks prepare:

http://scrumorakel.de/blog/index.php?/archives/30-How-to-prepare-for-the-Professional-Scrum-assessments.html

http://blog.rueedlinger.ch/2011/04/how-to-pass-professional-scrum-master-i-psm-i/

http://www.webgateinternational.com/2012/03/how-to-pass-the-professional-scrum-master-i-psm-i-assessment/

I hope others will add more links and study tips.