A couple questions: Does editing experience bear any weight when submitting transcripts for publication? If so it worth mentioning and how do you do it tactfully?
Secondly, does writing an article (non-paying) for a very little-known magazine count for much? Is that worth mentioning?
I'm actually not all that interested in writing an article of this sort, but will ask for it if I think it will be helpful in getting published later in a venue that I do care about. Thoughts?
I think the benefit is in the doing rather than in the advertising. That is, do it anyway for the inherent value of the experience, but don't depend on it to sell your writing.
Maybe KDW can help answer this. She edits a newsletter for the SF&F Workshop.
It is best to only include in a cover letter (or query) credits that relate closely to the material you are submitting.
If you're submitting an article on nanotechnology and you have been a research specialist in that field, then, of course you would include that information. You would also include it if you were submitting a story about nanotechnology. You wouldn't include any information about having edited a scientific journal, though.
As close in some ways as editing and writing are, they really involve different skills and a great editor is not necessarily going to be a great writer (as well as vice versa).
I'd recommend only including information about editing experience if they ask you to send a short bio.
As for the second question, if publication in a nonpaying and little-known magazine is the only credit you have, I would recommend including it only if it is a niche publication that relates closely to the subject of your article or story. (If you're sending an article or story on nanotechnology to ANALOG and you've had an article published in the JOURNAL OF AMERICAN NANOTECHNOLOGISTS, a publication only known to and read by a few people in the English speaking world, you could include that credit.)
Most nonpaying publications are not taken seriously by paying publications, so such a credit will not help you much. If they're also very little-known, that's another strike against them. Only include credits that will help the editor decide that you are worth paying attention to.