Looking at the numerous Openstack blogs on Internet I have found this one from Bryan Che very interesting. Bryan is a Redhat employee and on his blog he recently published an article why he believes Openstack is the feature for the Cloud.
The article is interested because is not a pure marketing but instead the author tries to convince us by listing a number of semi technical arguments. The full article can be found here: The 2nd Tenet of Open Source: Bet on the Community, Not the Current State of Technology
For me the most important argument that I agree with is that Openstack is going to win as long as its community continue to grow. The only that I would like to say at the end is that let's keep doing the good work and prove him right ;)