What Is DMOZ?

Dmoz 
http://www.dmoz.com
Ever heard of DMOZ? If you are in the field of SEO and you are well known with some good sites and Tools of SEO, then DMOZ is unknown thing for you. 
Dmoz is the Internet’s one of the largest directory system (over 4 million web sites) and is maintained by human editors(This is why DMOZ is important and links in DMOZ are counted). A web site listing in Dmoz can also be an important part of having a web site rank well in Google, because Google uses Dmoz results in it’s own directory.

Advantages of Dmoz :
Better relevancy than non-human edited directories and search engines.
Do not rank, promote or optimize sites, simply a data provider.
Disadvantages
Abuse by editors (not often)
Can take a long time to have your site reviewed
Tips for submitting your site to Dmoz
Make sure your site has original content and isn’t a clone of
other sites.
Make sure your site is error free and the design layout is easy
to use.
Check for spelling and general mistakes on your site.
Submit your site to a relevant categories, otherwise your submission
will be delayed.
Submit your site only once
Becoming a Dmoz Editor
It’s easy to become an editor at Dmoz, all you have to is,
Find a category that you would like to maintain.
Click the Become an Editor link at the top of the category
page.
You will then have to find 2 or 3 sites to add to that category
and explain your reasons why you wish to edit in that category.
Facts about Dmoz
It is in partnership with AOL
Hosted and administered by Netscape Communication Corporation
Self-regulating community
Serves results for search engine Google
On 25th May 2010 Dmoz had,
4,529,282 sites
 85,446 editors
over 590,000 categories
The one very important thing in using DMOZ services is that it takes long to get a site listed into DMOZ. Usually any directory service takes a maximum of 6 months time for approving your listing. But in DMOZ this time may exceed more. But once a site is listed in DMOZ, it is a great achievement for the site. Please read the dmoz submission guidlines properly before submitting your listing. Check that whether your site is listavle or not. Also check whether it is already listed. And also choose a single best category for your site in dmoz from the strong list of 590,000 categories and sub-categories.
Try not to fall in trap of such people who claim to list your site in bloody two - three days. It is not possible to do this by any green SEO method. And I personally do not trust on black hat techniques for SEO.