I work (apart from my sysop dayjob) as a it-trainer, so i need to design handouts for my students for which i use "Singum!", an old, but really nice DTP software. Normally i print the handout on my Epson LQ-500 dot-matrix printer (which produces really nice prints for an dot matrix printer) and photocopy them in the institute i teach in. I need to maintain attendance-stats, lists of exam-results and other spreadsheets, for which i use "VIP-Professional", it is Lotus 1-2-3 compatible and i have a small tool that converts its spreadsheets into *.csv if i need to send the files to someone with a more modern system. For the normal letter writing etc. i use "Papyrus".
I was thinking to put this whole "using an ancient computer in modern times" thing into an article for a while now, it seems i will have to stop procrastinating on this matter and start writing in the next few days ;-)