Wikibooks has requested that I ask your permission to set up an online book for GDL at:
Could you yes or no this so that I can continue collecting documentation (or not)?
Thanks for your time.
According to the "Discussion" page at Wikibooks this issue is settled - so I'm closing this item.
Anyhow, perhaps you'd like to have a look at the documentation effort that's ongoing in the GDL CVS:
and the compiled pdf is here: