Another page in the fight between what should fill server farms was written today.
The Register and Nick Carr discussed a new paper by IBM whose authors believe Google is headed in the wrong direction with their off-the-shelf approach to HPC/distributed grid computing.
I mention this because the paper can only be accessed from behind an institutional paywall.
I have my ways though, and found it sitting on an open server (for now). Here is the pdf of Project Kittyhawk.