I'm also working to get it where if you post a wowhead URL , instead of making the URL clickable, it grabs the item name from the URL and create the item link accordingly
i.e.
HTML Code:
http://www.wowhead.com/?item=18609
turns into
HTML Code:
[item]Anathema[/item]
I have it working on my forums currently but i had to modify another addon entirely to get it to work.