Ok with the coming of halloween patch I wanted to prepare you for a great money making before the market gets flooded.
The Headless Horsemen will be a special Halloween Only boss that can be summoned ONCE a day by a player with the quest. He has a chance to drop a ridable NON-BoP broom that varies from speed and style.
This is where you can get your cash if your fast and have about 4 friends willing to join you ^^.
When you have finished your chain quest to the point of summoning him have the other 4 abandon this step. Go to SM and summon, kill, and gain loot. Rinse and repeat this 4 more times with each player grabbing the quest to summon him.
Place the brooms in AH for 300-500g and advertise in it trade channel. With luck you'll have several bids in before the market is flooded and made a decent profit ^_^.
Remember you must do this the very day Halloween event is started to get max chance of AH control.
Here is the info of the horseman and strat to better prepare yourself.
Headless Horseman - WoWWiki, the Warcraft wiki