Trulia is a fantastic marketing avenue for Residential Real Estate that is For Sale benefiting both buyers and sellers alike. I can tell you that if you are trying to advertise your rental (lease) a great FREE online tool to do that is www.postlets.com
This website allows you to create an account and prepare VERY EASILY a cool online virtual flyer for rental properties or properties that are for sale and is available to real estate agents and your everyday user. Once created it will automatically syndicate to all appropriate online services opening the door to literally thousands of potential renters or buyers. You may also follow the easy instructions to copy and paste the HTML code to post an ad on Craigslist.
I utilize this not only for my personal properties, but as an additional service to my clients. Creating extra exposure. Here is an example of a virtual flyer that I have posted on Craigslist: