im just thinking of entities that would make it searchable

you can always add All for them if they do all or you can have specific categories like Music for sites like iGotMusic and also add Streaming sites aswell as DDL and Forums

Applications
Games
Movies
Tv
Ebooks
Xxx

And have them letters in the list! or you can just show All if you know what i mean

also if you add an average content count like 150K for triniwarez and same for DDL's and just update them now and again!

that way people can search by content count like > 100K would bring all sites that are bigger than 100K Topics/Posts

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Also what i would do is instead of clicking the link and it taking you to the site i would have another landing page where there is information in more detail, along with a screenshot, and your hit tracking results

also on that page will be a descriptions etc that are auto parsed from the sites meta tags, not hard to do... and also some social tag buttons and like tweek counters etc.. will be better SEO To have some constructed text relating to the site