I read Neuromancer originally in 1984 and again a few years ago, and for me it still holds up. It's not the greatest book or anything, and I found Count Zero to be much better, but apart from those two books I've yet to read anything else cyberpunkish that comes even remotely close.
Before someone mentions Greg Egan or Vernor Vinge, as they have elsewhere in the thread, I read a lot by these authors and didn't like them either. Way too dry, boring, and unimaginative for me. I know some people love them, but they're just not for me.