There is a strong misunderstanding of when sites are allowed a listing in more than one category.

First, a site that has a physical location is in many cases allowed a second listing in the most specific Regional category that matches the location. For multiple offices, in two cities they might get two listings in two cities, or for mopre than teo, they might get one listing at a higher level, such as state or county. The regional listings are in addition to a Topical (non-Regional) category listing. An address that is only a mailing address generally will not qualify.

This is not always true - for example, real estate sites only get a Regional listing.

Second, sites that are in multiple languages (not machine translated) can be submitted for each language - in fact twice - one for Topical and once for Regional - but this must be done to the section of World for the language. Do not confuse Language and countries - World and Regional, World is non-English, Regional is English by geography. Within each World- Language are Regional subcategories for that language.

See also Multiple Languages

Regional: Europe: Portugal Portugal specific sites in English
Regional: South America: Brazil Brazil specific sites in English
World: Português Sites in Portuguese
World: Português: Regional: Europa: Portugal Portugal specific sites in Portuguese
World: Português: Regional: América do Sul: Brasil Brazil specific sites in Portuguese

DMOZ does not allow multiple submissions and a site owner who does so, might be considered to be spamming. Submitting to one Topical category and one Regional category, and submissions for multiple languages are permissable.

However, editors may decide that certain websites justify additional listings, or for some sites such as IMDB or Wikipedia, a consensus may be reached that very large numbers of pages may be used and in those case, editors are encouraged to list as many pages as they wish. It does not mean that IMDB is allowed to submit thousands of sites.

In the earlier days of ODP, it was often encouraged for editors to extensively use some sites and list thousands of pages for them. As the directory matures, some of the sites will get re-evaluated, and may no longer be considered as good sources of information or the listings may now be considered redundant as other better sites are found. So some of these multiple listings may in fact disappear.

In addition some multiple listings are in fact not. Sites like Angelfire are free hosting services, and each individual listing is a separate entity. They just share a common root URL.

Here is a recent posting in an SEO forum complaining about ODP multiple listings and showing this as an example of abuse at ODP. A not very well thought out post and I feel sorry for anyone who uses SEO info like this.

1 231,774 CNN.COM - currently used a a source of news pages
2 99,391 GEOCITIES.COM - shared hosting
3 34,923 TRIPOD.COM - shared hosting
4 30,450 ANGELFIRE.COM- shared hosting
5 20,530 AOL.COM - shared hosting
6 20,508 TOPIX.NET - massive source for RSS feeds
7 15,605 YAHOO.COM - shared hosting
8 14,202 FREE.FR - shared hosting
9 13,508 NEWADVENT.ORG - Catholic Encyclopedia used like Wikapedia,
10 9,411 IMDB.COM - used as a master source for movie information