As far as I know, this kind of AddOns is not possible at the moment. But what I want to know is, is there anything like
http://www.wowwiki.com/World_of_Warcraft_API so I can see what is possible and what not.
Since it was difficult to find even this website, I would also like to know if there are more websites like this.
For those who don't play WoW:
Auctioneer handles the auction house, recomment prices, scans for cheap items, and a lot more (
http://www.auctioneeraddon.com/ )
Gatherer saves the mining veins and displays it on the minimap and worldmap (
http://www.gathereraddon.com/ )