I was going through my electronic editions the other day, and was surprised how many I had--some quite old fashioned looking now, admittedly--from 1997~1999. Many of these are now out of "print" and, I would guess, unlikely to be "reprinted" in their original form due to subsequent changes in technology.
In some cases, copies are likely to be found in libraries around the world, so preservation for those is probably less of an issue. But some of the really early html/flash/etc ones in my collection were far more informally published. In some cases, I just have a disk from the author.
The editions I have are internet age incunabula and are not yet obsolete from an operating system perspective. But of course editions and digital projects go back much farther--hypercard, dos, unix programmes, etc.
Does anybody know if anywhere is actively collecting/preserving this kind of material? Obviously the Oxford Text Archive does collect texts--but in the pre-internet and early SGML days, you also had information machines where content was very closely associated with software (for a discussion of one famous case see: http://www.mun.ca/mst/heroicage/issues/7/ecolumn.html).
-d