Ahhh... quite right you are, thanks for that. I hadn't seen that API call, just the others that I use currently. That would make rather more sense from a user perspective in terms of being able to select books and choosing to update their tags. The downside is the volume of additional API calls but it's not as if you should be regularly overwriting your tags.
Last edited by kiwidude; 03-01-2011 at 05:49 PM.