Adding your website to directories is must as it drives a lot of traffic to your website. One such directory where you can add your url for free is Free Add Url, they don't charge you any fees for adding your link.

www.freeaddurl.org

Directory offering categories for business, shopping, finance, computers, Internet, free stuff, and free deal related quality resources. Reciprocal and paid submission options are available.

www.highstuff.com

Searchable directory of family-friendly and spam-free websites organized by subject. Offering free and paid submissions.

www.elegantdirectory.com

Directory of online sweepstakes, contests and free giveaways. Free to enter. Updated daily.

www.contestgirl.com

A searchable directory of websites organised into a wide range of categories.

www.adirect2z.com