Google for Developers

There is a very interesting series of lectures on YouTube from Google developers, it's called Cluster Computing and MapReduce. It starts with general parallelism and distributed computing concepts but gets by the second lecture into the intricacies of Google system and even a hint of algorithms. This is very strange since Google is very closed in general but especially when it comes to its in house implementation. If this isn't just a mistake, kudos to Google for sharing these lectures with all of us, mere mortals.