I haven't found many, but there a couple well done Nightmare sites I've found in my travels... the ones I think are worth a look are right here (and I'm picky, so trust me... they're good)

A Nightmare on Elm Street.com - Not the 'official' site, but it's a whole lot better. Plenty of multimedia goodies to be had here... pics, vids, sounds... if ya want Nightmare media, this is the place.

Nightmare on Elm Street.com - This is the official site. Not as in-depth as one would hope, but if anything, the Coroners report section is pretty funny.

House of Horrors: A Nightmare on Elm Street - Good summaries of the movies here... and a little FBI 'Freddy File'. Interesting little section anyway.

Kissed By a Nightmare - Got a few pics from here... far be it from me not to give credit :) And that's the hallmark of this one... some good Nightmare pics here.

A Nightmare on Elm Street.net - Sort of in the same line as the .com site... a little of this, a little of that. Loads kind of slow though, but once you get past that, it's a pretty good site.

The Dream Master: Nightmare 4 Fansite - Got a couple tunes off this one... it's just about the fourth film. Since the 4th is one of my faves all around, I gotta list it. This one's hallmark is it's music.