Now you probably know there's a lot of the above on Youtube. These include "fanvids", clips of the man himself, fake Hobbit trailers, the entirety of The Return of the King (1980), and amateur re-enactments of the Fingolfin/Morgoth duel.
I'd like to share this oddity - The Tale of the Children of Húrin "trailer", assembled from other movies.
http://www.youtube.com/watch?v=CH2kv9xyUTA
Spot the actors/actresses/sources! I don't know where the clip came from, but "Mîm" is amazing. (posted on TORC some months ago)
Edit:
Morgoth vs Fingolfin 1:
http://www.youtube.com/watch?v=bqHJEu3JT-0
Morgoth vs Fingolfin 2:
http://www.youtube.com/watch?v=Qsgc3LvK-K4
Morgoth vs Fingolfin 3 (CGI, Lego-ish):
http://www.youtube.com/watch?v=sdAZu5dFr00
"Spirit of Fire" - about Fëanor, naturally:
http://www.youtube.com/watch?v=ED3hJjuJDxE