Anyone else notice the new AH interface implemented in today's patch? It makes dividing stacks up really easy if you are trying to sell individual items. Now I can get most of my auctions up pretty quickly. You can also set the price for one item and it'll put up several auctions of that same thing. Very helpful IMO, although I'm sure there was probably a mod out for this already that I'm too lazy to find .
I've never used the vanilla AH interface, but what you described seems to be what the auction addons do. But the auction addons can also scan the AH and create a database with a price history of all items so that you can see what an item was sold for a few days ago (especially helpful if you have never sold that item before). Links to the two popular ones: http://wow.curse.com/downloads/wow-addons/details/auctionator.aspx http://wow.curse.com/downloads/wow-addons/details/auctioneer.aspx
You are right the new AH interface is very similar to the Auctionator addon. However at least for me the new interface posts multiple auctions at least twice as fast for me as auctionator. Saves me a ton of time when posting. I don't think I will use Auctionator anymore except to get the undercut price to post with.
Anybody else notice the AH deposit is now double ? Stacks of frost lotus (20) were 3g for deposit and lichbloom / icethorn were 65g each for deposit now they are 1g 20. Why do you care? well if you lose an auction you now lose a lot more and every gold adds up.