the thread "state-of-the-art for algorithmic hooks and Lilypond+(La)TeX" caught my eye because I recently started documenting what I'm studying in music and because I often stumble upon pdf's in imslp, method-books for guitar and piano, which use a lot of text and scores (obviously). In the case of the old method-books, like for guitar of Guiliani, Aguado, etc... the main element are scores and text is merely explanation, in other words the focus is on the scores, but more advanced text handling would be welcome.
I've been working one way in latex, adding scores as "by lilypond rendered images", and I have been experimenting with adding text in \markuplist blocks with scores. Both work 'ok' but of course latex is way more advanced for text and on the other hand, having to crop each png rendered image is quite a cumbersome task.
So far I've only seen documentation and discussion about inserting lilypond code into a latex document. I've tried it, but it gets fairly technical for me, and I often include lilypond files in others, which makes it even more complicated to use lilypond-book.
I don't think it is possible now, but maybe it would be interesting to work the other way round: inserting latex code in a lilypond file. Or would it be possible? :-)