Little items that are used often will always make you more than big ticket items in the long run. A lot of playing the AH is having patience. Like someone else said Bags always make money. If you have Tailor it is gold. I sell 15-20 Netherweave bags and 8-12 frostweave bags a day. I buy cloth in bulk thru trade and make bags to sell. On my server this usually nets me 270-400g per day.

I also sell pets cross faction. I have horde toons selling Ally tourney pets. they money i make from selling them goes to buying horde pets and selling them to allies. Prior to 3.3 I would sell 2-3 pets every 1.5 days. netting me 1200-1600g from pets.

Since 3.3 I have stopped doing my dailies as I have now hit crusader and with the money I have made I don't feel the need to daily anymore. On occasion I will do them for the seals. However that has slowed down quite a bit.

Since 3.3 I have turned to buying and selling primordial saronite. I can usually make a 200-300g profit per saronite this way. However this is not really thru the AH so its a little off topic. I buy/sell these thru trade chat.