I would love to get a list of language features that are "free to use with GNAT" and those that are "AdaCore license required." The last time I did Ada (admittedly, back in the 90s) it wasn't all that clear what language features I could use for free. And since we're on lists of things, a list of zero-cost abstractions and non-zero-cost abstractions would be nice.
I'm pretty sure these aren't big issues these days, but there's still a lot of people walking around thinking "I can't use Ada on this project, I don't have budget for a commercial compiler." Maybe a "project manager's introduction to Ada." I would write it myself, but I've forgotten most everything I learned about the language and it's development community.
[Apart from that... young engineers should definitely check out Ada, even if you don't eventually use it. Why it was considered a good idea to create a new language, the problems language designers were trying to solve and how developers used the language to build code that was more bullet-proof than C++ is kind of an interesting story.]
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