The only reason I make this necro-post is in case an Internet search brought you here, as one just did me, be aware that this 12-year-old post has been supplemented by a later (and thoroughly enlightening) sticky post “Meter in Tragedy (Split from topic “Let’s Read: AJAX”)” http://discourse.textkit.com/t/meter-in-tragedy-split-from-topic-lets-read-ajax/14340/1
Note as well that in the above posts, the first and last of IreneY’s three links are dead, and the second of annis’ two posts is dead. After twelve years, I am surprised any of the links is live.