Cyberpunk:
Jon Courtenay Grimwood - Gets it spot on, ultraviolence at 10 000 Kmph.
Steve Aylett - Cyberpunk-satire.
Jeff Noon - Has some interesting ideas, definately style over substance.

Other messed-up literature:
JG Ballard - Greatest living author, absolute genius.
Luke Rhinehart - You must read 'The Dice Man' it will change your life.
Chuck Palahniuk - Flavour of the month, but with good reason.
Will Self - (anti) moralist.
Don Delillo - Paranoia and popular culture as fictocriticism.

Philosophy:
Deleuze (& Gutarri)
Nietzsche
Heidegger
Baudrillard
Jameson - Says cyberpunk is the literature of postmodernism.

Poetry:
Baudelaire
Rimbaud