As of the current edition (11/28/07), this is limited to only enchants, and does not include leather armor packs, inscriptions (such as you can get from Aldor), or gems, or any others. Plus, it only covers the slots I know about enchants for, so I probably missed some. I'll update as I come across them.
For any of you who got to watch as I posted and re-posted about 50 times, I was trying to figure out how to make the new style wowhead link for an enchant rather than an item. I have it working for items (ie Terokk's Quill), but not for spells (ie Enchant Bracer - Assault). I decided to just list them out for now, sans fancy links.