WARNING: Automated Submission Services Can Be Dangerous to your Website!
Every website needs links, but buyer beware! There are many low cost services that automatically submit your website to 1000s of directories. I saw one for $5.95 that claimed to submit to over 10,000 directories! Don’t do it! Unless you want to be in directories that have nothing to do with your industry.
You actually could be penalized by search engine by having too many “inappropriate link backs” to your website. An extreme example would be having a website submitted to “Children’s Toys” instead of “Adult Toys”. Even lesser extreme mis-categorized directories can hurt your search engine results.
10 or 20 directories are all you really need. DMOZ and Yahoo are the top 2 directories.
DMOZ is free, but it is run by ‘human editors’ who often have ‘conflict of interest’ motivations. You might not get in, but try it anyway. Be careful to submit to the proper category!
Yahoo will cost you $299, but it is a must for any serious website.