Hmm, what to read? A lot. Here are some authors which I think are well worth reading from a transhumanist point of view (in no particular order):
Greg Egan: esp. Axiomatic, Quarantine, Permutation City, Distress and Diaspora (hard sf; some find him dry but his ideas are wonderfully up-to date)
Linda Nagata: Tech Heaven, The Bohr Maker, Deception Well
Bruce Sterling: Shismatrix (THE transhuman space opera)
Greg Bear: Blood Music (probably one of the few real Singularity stories around), several other good novels (especially if you like BIG things blowing up - like planets or stars :-)
Olaf Stapledon: First and Last Men, Starmaker (transhumanism from the 30's. Pessimistic but grand)
Vernor Vinge, True Names (short story), A Fire Upon the Deep (space opera)
David Zindell: Neverness and the "A Requiem for Homo Sapiens" trilogy
(The Broken God, the Wild, War in Heaven) (philosophical/mystical
transhumanist sf; likely not in everybody's taste)
Iain Banks: the Culture novels (shows glimpses of a fun transhuman civilization, very imaginative stories and often somewhat cruel to the protagonists)
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