My top 5....
Richard Morgan Altered Carbon - a world where you walk around with a recorder in your head, your mind is freighted from planet to planet via 'needlecast' to be installed in a new body and the dead can be brought back to life... at a price.
John Courtenay Grimwood - Lucifers Dragon - Passion Di Orchi is no more than the obscenely rich daughter of a west coast mafia boss until she decided to rebuild 17th Century Venice in the middle of the Pacific.
Neal Stephenson - Interface - In which the US president is chipped and controlled by spin doctors until a paranoid Mid-western trailer trash redneck decides to rebel against the system....
Terry Pratchett - The Truth - A fantasy worlds first newspaper editor, William de Worde just wanted to get at the truth. Unfortunately everyone else just wants to get at William. an amazing cast includes Otto the vampire photographer whose own flash makes him disintegrate into dust, and Mr Tulip and MrPin, a pair of underworld figures straight out of a Tarrantino movie.
Iain M Banks - The Player of Games -
http://www.vavatch.co.uk/books/banks/#player
All his 'Culture' novels really.