If you are level 70 and have a flying mount, one of the easiest ways to up your cash flow is to do Daily Quests. Daily quests are quests that Blizzard has built in that offer reputation and a gold reward, and they can be repeated, but only once per day. There are two in Terrokar Forest (in Skettis), and four in Blade's Edge Mountains (Ogri'La) that each have a 12g reward. Generally I can do the 4 in Ogri'La in about 20 minutes. These CAN be completed in groups...that helps you rack up the kill count faster. The ones in Skettis have no pre-requisite. The ones in Ogri'La do have pre-requisites. They start by talking to the ogre quest-giver up on a tower just outside the Circle of Blood in Blade's Edge. There are some daily quests in Shadowmoon Valley for the Netherwing faction...but they require you to already have 300 riding skill (Artisan - ie: epic flying for 5000g), and they aren't as easy as the Skettis and Ogri'La quests.