Having worked with Xserves in the past, this article is pretty well formulated. The only thing i disagree with is that they should have moved to a 2U system.
Many educational institutions that were running maybe only one or two Xserves did not have 4Us in their rackspace for 2 servers. Small schools only had half racks to begin with.
I live in the UK, so January is very much still in "Winter", but for some reason when someone says "Winter 2011" I think of it as the same as "Q4 2011".