Hi Tim and everyone,
I should have made it clear that my list of Advantages and Disadvantages refers to the Moodle 1.9 version. This is the only version I've used as a teacher with live classes and the possiblity of using Moodle 2.0 that way is months away in my situation. But I'm a convert (deliberate religious terminology ), I'd never voluntarily go back to using the old forum. ForumNG is a great time saver when you're dealing with a lot of students and and a lot of messages.
I forgot one little disadvantage, even though it's AJAX, you have to click twice to rate a message instead of just once as on the standard forum. Is there a reason for it?
Cheers,
Glenys