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The short answer is yes, absolutely worth it!

Here are the advantages:

1. They provide a list of directories that take submissions
2. They save you time by automating the data entry required for each directory
3. They keep track of which directories you have submitted to
4. They give you an indication of the page rank strength of the directory
5. They update the list of directories with new directories regularly

Here are the disadvantages:

1. Some tools are just used by spammers to harvest your details
2. Some tools only provide semi-automatic data entry and you still need to manually enter some details
3. Some tools only allow you to store your data online

Overall directory submission tools are a must if you are looking to build back links and promote your web site.

There is one free directory submission tool that I use called Submit Helper as I find its features are easy to learn quickly. Check out Submit Helper 0.5 (beta) here.

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