If you are as addicted to the auctionhouse profits as i am, you can double your profits using this trick.
This requires 2 accounts, (just make a friend help you if you dont have another acc handy)
Get one horde char on one acc, and an alliance on another.
Get them, one way or another to the neutral auction house in tanaris and save hs there, (remember flypoint!). you can eventualy get a escort from another player so you dont need to level the horde auctioneer that mutch.
The trick is searching for hot Items like BOE blues (prefferably 61-70ish) or items that require intense farming. Bags are good to start out with since they are relatively cheap and easy to sell. Specialty items like stuff from blue resipies(spelling error i know) can kill if the horde side do not have someone who can craft that.
You need to do some work on the AH´s for this to work, find out whats hot, and get it at half price on the overcroweded ally ah, sell it for a nickle set it up on the neutral ah (cheap and fast so your horde char can get it ) and go sell it for twice what you paid for it.
I have currently put this tactic in use, using 2 lvl 40ish to transfer the items.
If you wish to transfer the cash back to the horde char, just put crap up for some insane price on ally char on neutral ah, and purchase with your horde.
NOTE!!!!
Allways check for bottomscanners!!!
You can do so by selling an item thats worth over 50s for lower than the vendor price, if someone is scanning the feeds, it will be bought within 2 minutes.
Im sorry if anyone have posted this before, (not to my knowlege)
I hope this helps you guys as mutch as your tips/guides help me.