It seems disk imaging is mostly used for clustering (might be using an IBM Blade Center soon). But I found System Imager (www.systemimager.org) to be useful even if you don't have clusters. We seem to buy/build machines of similar hardware (IBM xSeries) and have in the past installed the same set of software for the most part. So the process of building one or two images and just coping it to the drives seems to be a time saver.
I just started with SI so I need to work on installing the image on a machine with different hardware/partitions, but it can be done.
So if you find yourself doing lots of installs of the same stuff you might want to give it a try.
John
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