Zelazney is easily my favorite author (Miss you, Roge.
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My all time favorite book is probably <i>Dune</i>.
My Favortie series is George RR Martin's "Song of Fire & Ice", with Tad Williams' "Memory Sorrow, and Thorn" tied with Glenn Cook's "Black Company" series for second.
Lot of people have mentioned Discworld. I haven't read many of them, and, of those I have read, <i>The Colour of Magic</i> is good, but <i>Small Gods</i> is my third or fourth favorite book ever, easily one of the most brilliant things I have ever read.
I agree that Jordon has gotten old, but I've invested enough in it that I am going to see if he can finish before cholesterol catches up with him. (New book in November, I think.).
Terry Goodkind is sort of like Jordan with an R rating (so's Martin, but it's the difference between Porky's and The Godfather). Before his last one, I was going to give up on him, but I found a signed copy of <i>Chainfire</i>, and it was significantly better than the last three, and is a cliff hanger, so he's into me for at least two more. If he sticks with his whole pornography of violence meets pseudo-fascism (and that's the good guys), then I'll say goodbye to him.
Someone mentioned Phillip Dick and Alfred Bester in the same breath. Sorry, but, though Bester was brilliant, Dick just makes me choke. Storys start in the middle and go nowhere. The only more annoying writer I have run across is Sam Delaney, who seemed to be out to prove that you could masturbate with a typewriter. Reasonable people can disagree on this, but I honestly can't see how.
Props out to Steve Brust, Jammin' JRR Tolkien, and MC HP Lovecraft. Yo!