At iPRES 2010 I was on a panel chaired by Neil Grindley of JISC entitled How Green is Digital Preservation?. Each of the panelists gave a very brief introduction; below the fold is an edited version of mine.
Reinforcing the point I have made over and over and over again, that the threat of software and format obsolescence is vastly over-blown, here is a year-old Slashdot story pointing to a contemporary blog post listing a selection of ancient operating systems that simply refuse to die, with comments providing many more examples.