Andrew asks via Twitter: Doing coverages for a producer offering critiques of my coverage in exchange; helping me to build a coverage portfolio. Good idea or sketchy?
I think it's a good idea - as long as you're not doing it for free forever. Anyone who writes coverage starts off doing it for free; I did it at two of my internships, and I also read plenty scripts and gave my agency boss quick verbal assessments without getting paid extra. (Official agency coverage is paid for.) As you're learning to write coverage and building your portfolio, this is necessary. The producer's critiques will help you improve your coverage and learn about what people look for in scripts.
However, keep in mind that the producer is getting a free service that s/he could be paying someone for. I don't think you should continue this arrangement for more than a few months; most interns work for a semester (Jan-May or August-Jan) - so that's about the amount of time I think is appropriate. After that, you should transition to being a paid reader, or move on to being a paid assistant (either at this company or somewhere else).
If you're a writer, you might also eventually want to ask the producer to read your script and give you feedback. After you've been working for free for this person for a couple months, I don't think this is asking too much. The producer might say no (or say yes and then never read it), but you don't really have anything to lose by asking.