Music, audio technology, recording technology, guitar, photography, books, beer, food, sleep (lack of it most of the time),
Lots and lots of it. My Dying Bride, led zeppelin, opeth, pink floyd, tristania, rotting christ, moonspell, hendrix, Type O Negative, dead can dance, emperor, old man's child, dimmu borgir, amon amarth, amorphis, behemoth, novembre, peccatum, haggard, storm, requiem aeternam, fidelius, gny, conan the barbarian soundtrack, u2, soundgarden, rhcp, wnyc's new sound and sound check, and classical (especialy for guitar).. I am going to stop now but there are many more.
Right now I am stuck in the Dune series written by Frank Herbert's son. Here are some of the authors I like: W. Gibson, I. Asimov, J, Steinbeck, Pratchett, William Warthon, ......