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This is awesome! I never really knew what trance exactly was, but this made it cyrstal clear to me, as well as it's subgenres.

Does anyone know of a similar type guide to techno or house? Theres just so many different niches in both of those genres as well.

Psytrance is already a sub-genre of trance; this site doesn't reflect trance as a whole.

Ishkur's Guide to Electronic Music

Outdated (accurate only to about 2000) and requires Flash but still a good resource: http://techno.org/electronic-music-guide/