If we're talking about literature there's a lot more that I can mention. The proliferation of Lord of the Rings references particularly among black metal and power metal is significant enough that last.fm has an (albeit sparsely used)
Tolkien Metal tag. This fact forms the basis of my Incredibly Dangerous Lord of the Rings Extended Edition Drinking Game*. Other fantasy and weird authors that are very popular in certain circles are Robert E. Howard (Particularly in old-school American power/epic metal of the Manilla Road and old Manowar vein) and HP Lovecraft, who pops up all over but is particularly popular in certain breeds of funeral doom and drone, as well as being a referent to many dark ambient artists. Outside of these few it's quite hard to think of fantasy authors directly referenced in this most nerdy of areas. The only author I can think of with serious recurring references is Lloyd Alexander (The band Cauldron Born, Manilla Road's 'Spiral Castle' etc.) There's also an, I think, Italian power metal band who base a lot of their material around the Chronichles of Prydain but their name escapes me. Much more common in power metal, both old and new, is the use of the established genre expectations of epic fantasy and swords and sorcery in their lyrics and artwork. Some even go as far as adopting the narrative distribution mode of fantasy literature, treating each album they produce as a new 'volume' in a series of musical fantasy novels. The most outstanding proponent of this is the somewhat eccentric Bal-Sagoth, for reasons that will become clear as you read their
liner notes.
Space rock trades heavily on literary references to science fiction and science fantasy. Michael Moorcock was even a mamber of space rock grand-daddies Hawkwind. Prog metal/space rock fusion band Star One's whole conceit is that almost all their songs are about a different science fiction film or TV series. Here is their song about
Blakes 7, for example.
On the film front, though it's more about genre than a particular film, but psychobilly culture is almost entirely built on the ethos of 40's, 50's and 60's B-movies, and in fact on TV series (The Munsters and the Addams Family come to mind, the Munsters particularly for the influence the cars had on the hearse scene). Probably worth mentioning at this point the fact that distinctive dress style of Morticia Addams and Vampira has had more than a small influence over goth fashion, particularly for women.
All this stuff is a bit more general than what we should be getting at here though, I think.
*Whenever anyone says the name of a heavy metal band, drink. Canonical list:
Amon Amarth (Mount Doom), Amon Sul (Weathertop), Anduril, Aragorn, Arwen, Balrog, Baranduin (Brandywine), Celeborn, Cirith Ungol, Denethor, Fangorn, Galadriel, Gandalf, Gollum, Gorgoroth, Helm's Deep, Isengard, Lothlorien, Minas Morgul, Minis Tirith, Mordor, Morgoth, Moria, Nazgul, Orc, Orodruin, Osgiliath, The Ring, Rivendell, Saruman, Sauron, Troll, Uruk-Hai, Wormtongue