Suggestion! Research how many other agents in your direct selling area, use and utilize Trulia? Do they contribute only their listings, Do the have a blog? Do they answer Q & A questions? Do they contribute advice, do they contribute by adding discussions? The point here is the more you use it, the more you are EXPOSED to the public!
Trulia is only one networking site, use Active Rain, Face Book, LinkedIn, My Space, Twitter, (other networking sites), your Brokers site, and your own website, and inter tie them together. If you don't have a blog get one!, tie those blog entries to every other site.
You essentially want as much exposure as you can get, preferably Free, but if you have to pay make sure its something that syndicates your exposure of listings, blogs, comments.
Something I just started is working for me "MLXJET.com" provides "Branded Email". It gives you the ability to present a Professional 1ST Impression through your emails, that can have links directly from your email to your website, your blog, and other possible links. Check it out!! http://www.mlxjet.com/Branded_email.php now. Type in my special discount code, which is MD7020 and get it for less than half price.
Google pay-per-click advertising is great too, but only if you are in a smaller market or have a targeted niche. For instance I look for buyers in the urban loft market in Nashville.
I provide great content on my website. Combined with IDX, e-newsletters, and pay-per-click, I average 35-42 inquiries/registrations per month. They don't always give their full contact info, but usually at least an e-mail address that I can add to my e-newsletter.
Facebook and Myspace are also great ways to keep your name in front of people who already know you.
Often, with idx and your mls is your listing are fed into a data feed that is eventually distributed to all the major search engine portals like trulia, realtor.com etc...
If you are looking for an effective "tool", visit http://www.postandsend.com