I have written a book about Allegro 5 and is actually online.
You can have a look at http://www.anothergames.com/book/book
The allegro 5 wiki has it already listed as an online tutorial, but it was first written as a book
I was thinking of my book being added on http://alleg.sourceforge.net/books.html
It is actually online, but I have a copy of the book zipped
If you can
publish my book (which is normally free) on your Allegro 5 book section
(Adding my online tutorials would be nice)
and remove the "We don't know of any books about Allegro 5 yet"
I would be glad to give you the zipped version of the book or to make a
downloadable version on my website.
Thanks!