Not many people know about this, so i decided to post it (so it will be recognised for how useful it really is ). Basically, on the wow website, there is a section called wow toplists. Most people just glance at this, because it is set by default to show the top most dangerous NPC's in the game. If you look more closely however, you can see it has toplists for almost everything!
This is very handy when you are new to the AH and auctioneer, and do not know what to buy. It tells you the top most selling items in the AH! This at first doesn't seem that useful, but you can also see what sells the most for every individual day! This is very usuful because it:
1) tells you what sells easily so you can check prices daily and snatch up the cheap auctions
2) it shows you the trends in the market, especially useful for weekends.
3) when a new patch comes out, you can quickly identify new popular items and glyphs, and adapt to the market (as your auctioneer data is no longer useful!!)
Combined with auctioneer, this is a killer strategy for getting gold, and it only takes a few minutes every day!! Personally i use the US version (even though i use EU servers) simply because US servers are more popular but either is good. The links are below:
World of Warcraft Top List <---- US
World of Warcraft Top List <---- EU