Unless an internet listing features a appropriate categorization , or possibly a appropriate theme in mind, it is simply not value producing the listing. Being a webmaster , we are doing our responsibility to educate and help the layman visitor, but except if we ourselves usually are not educated adequate, ought to we be trying it ? As I'd described previously , many wannabe listing owners ( intellect you i'm not stating I am a learn :P by a protracted shot ), inquire throughout the concern of what groups ought to they be creating of their listing and sometimes they are even prepared to order comprehensive category construction of yet another listing or even tailor made groups ( I would get flamed for this, lol ) . If this was the situation, why don't you simply use the DMOZ RDF dump, like quite a few quite a few other websites, which can be accessible for no cost ?