Maybe today's OCamlers are by and large beyond needing that sort of
book. But it's kind of self-defeating to take for granted that the
status quo will continue. I'm inclined to think that as OCaml gains in
popularity--as it is certainly doing--there will be more people who need
more hand-holding. Which doesn't necessarily mean there's much of market
for a book such as I've proposed, just that I see some reason to hope.
I haven't the faintest idea what the market for such a thing would be,
but if a good book on using Tk from OCaml existed, I would buy
it. Similarly for a Gtk/Ocaml book.
y