This is a very minimalistic addon that adds an item's basic info to the tooltip, in the color of the item's quality. The info includes an item's icon, id, item level, stack count, and type with subtype.

Commands:
/qualityid or /qid displays a full list of commands:

• /qid {toggle|on|off} - enables or disable all info
  

• /qid id - toggles the itemid
  

• /qid ilvl - toggles the item-level
  

• /qid icon -toggle the icon
  

• /qid stack - toggles the stack count
  

• /qid itemtype - toggles the type: subtype
  

• /qid topline - toggles an extra line above QID's info
  

• /qid botline - toggles an extra line below QID's info

Any questions, comments, or suggestions please post them here in the comments section.

P.S. As of Aug 6, 2009, I most likely will no longer update QualityID. It's been a great year. Other parts of the virtual world now pull me towards them. So long, and thanks for all the fish!