Okay, some people will say this is common sense, others will say that I'm just re-iterating old posts, but making gold has never been this easy.
Since the addition of achievements, specifically those involving non-combat pets, there has been a huge demand for these pets. Many people don't know where to go to buy them, and people on the opposite faction can't buy some pets that are from faction specific vendors. Currently on my server I have been auction pets that cost me 45s from 10g to over 20g, I've made over 300 gold this way already. I've sold Owls on the alliance auction house for 10g each without a problem, and for 20g on the Neutral Auction House.
This
website (www dot blizzardguides dot com/wow_vanity_pets.html) has a full list of non-combat pets, and also tells which ones are faction specific.
If you have 2 accounts or a friend on the opposite faction you can make an even bigger profits, I have been told that while Owls sell for 20g on the Neutral AH, they go for 30-40g on the Horde Auction House on my server.
I will post a screenshot shortly of my successful auctions.