I liked Iain Banks's stuff, The Bridge is my fave I think (ripped off by Irvine Welsh in The Marabou Stork Nightmares imo). I've got a big black and white section of my bookshelf!
I think Iain M Banks is the forum's unofficial favourite author. Doesn't get so many mentions without the M, but that's how I prefer him.
Wasp Factory, Complicity, Crow Road, Espedair St would be my top ...err... 4
(or Player of Games WITH the 'M' )
Song of Stone was deeply depressing, with no redeeming features