Slightly Foxed is a delightful British quarterly publication launched in 2004. As they describe their mission:
Eclectic, elegant and entertaining, Slightly Foxed unearths books of lasting interest, old and new, all of them in print. Each issue contains 96 pages of personal recommendations from contributors who write with passion and wit. Slightly Foxed aims to strike a blow for lasting quality – for the small and individual against the corporate and the mass produced.
Their remit is all literature, not just children's, however, probably 20-30% of their articles either are about children's books or touch on them.
I like the fact that they focus on sustaining attention on lasting quality, and the fact that they often cover children's books. However, their strength is simply excellent and compelling writing. The quality of the essays reflects their choice of contributors and the value of what those contributor's have to say.
Of the many thousands of books I have purchased in my life, I doubt I have ever purchased a book on cooking. And yet I found myself reading an essay some months ago by a contributor recollecting and elaborating on a cooking book from the 50's or 60's. And not just reading the essay but thinking to myself, "I need to keep my eyes open for that book".
If you want great writing about neglected books I highly recommend Slightly Foxed to you.