Wow...alot of Fantasy fans here...
I read only Fantasy and a bit Science Fiction...

Favorite author is definitly Roger Zelazny...which makes "The complete book of Amber" my favorite book...
I also like the Warhammer 40000 stuff by Dan Abnett...
I don't know what to choose I've read so much...
Right now I'm reading a Warhammer novel Felix&Gotrek:Manslayer by Nathan Long and
Shadowfall by James Clemens...