In GrowUrl also have trial version, but if you want your ad to be send over many sites, I recommend signing up. Unfortunately, to be a member you have to pay. If I'm not wrong about RM13 equal 4 USD. However, no need to worry; we can also claim the free credit growurl.com.
Once I register, the result is good; my blog is everywhere, meaning what? Once we register our blog at Growurl, then Growurl will submit our blog to hundreds of classifieds sites and blog directories. As a result, our blog will be famous and will even automatically rise up Alexa Rank. Lucrative, free to get traffic.
The story is like this, you have a beautiful trinket, which many famous shops and supermarkets want offer you to put your gadget there. So, your goods will sell quickly, or at least there are some visitors who take a glance. Similarly in blogging, imagine that you have a blog with a beautiful template and interesting content, but you do not know how to get visitors, it will be just useless, right? Thus, frequently seek for information from google about SEO.
Back to GrowURL, I strongly encourage you to register your blog on GrowURL, besides that, DMOZ and Technorati is certainly the most important. Registering is free, then you wait and see the results a few weeks later.