Using the Daily Chance helps and selling the repeat items or unwanted items is always good. If you go to the avi arena, the art arena, or the housing arena you can get gold. 40g for your first comment and 20g for your next and then after that it gets less. Also 14g to vote on the first selection.
Commenting in people's profiles is 40g the first time a day.
Making a mule account with an alternate email you suggested to the site makes some money and then you can drop off all that extra stuff you get and can't sell into that account to keep clutter from the main. Also having a second account give you the gold bonus for first post twice. Some people do this with many accounts, but that is way too much work for my personal taste. One mule to carry my extra stuff and to cos-play as my favortie book character is all I ask.
Some people gamble at the marketplace. They earn enough gold to buy two or three investment items and then they wait till prices go up to sell. Now is actually a pretty good time to do that because prices will or should be lowering in post Christmas lull. Then in a few months or a year or whenever they sell it at profit (of course you have to have a reasonable beat about what will inflate and you have to be patient).
Another thing is that there a lot of user sponsered contests and games you can play. Of course, you don't know whether or not you'll win of if the person hosting the game will actually pay up. Never hurts to play a free game though. ^_~
Some people also make money by selling cute siggies or other services you'd have to go look there to see what was sucessful or not though. Certainly I'm not skilled enough to make money that way.
Beyond that find topics that interest you and post. Feel free to friend me I'm blindfaith^_^ and le petiti prince^_^ over at gaia. I'm on a bit of a break cause my prefered forums and guilds are slow, but hopefully it will pick up soon and I'll have saved enough up for a Hermes' Moon.