I'm in the field of engineering, electrical engineering specifically. I find myself with several technical reports and notes I've written over the years, and some colleagues have asked me for these. I think these may be beneficial to others, too and I'd like to make these publicly available somehow.
I've refrained from using the word "publishing", because I don't ever intend to submit it to a conference or a journal - the type of material just isn't right. See here http://www.mers.byu.edu/docs/reports/MERS9401.pdf for an example (I'm not the author of this particular note). arXiv doesn't cover electrical engineering topics; also, I doubt my reports would qualify "preprints", because preprints, as I understand, is something the author intends to publish eventually.
I know some folks who post these on their websites, but the danger is that self-maintained websites may eventually disappear, and with the websites, the reports themselves. Is there a good solution we have about this today? Perhaps a public repository?