There are a bunch of cloud and distributed computing blogs worth reading including:
Simon Wardley – Bits or pieces?
Ben Kepes – Diversity Limited
David Linthicum – The Infoworld Cloud Computing Blog
Krishnan Subramanian – CloudAve
But the one i keep coming back to is Werner Vogels - All things distributed. Its good for insight and also for some great links to essential papers by Jim Greay that are deeply relevent to distributed computing developments.Certainly worth reading.