jrobb points to a list of free singularity books. haven't kept track of development in that field for a while. time to read :)

• Engines of Creation (Drexler)
• Unbounding the Future (Drexler)
• Nanomedicine (Freitas)
• There is plenty of room at the bottom (Feynman)
• Leaping the Abyss (Pergamit and Peterson)
• The Age of Robots (Moravec)
• How long before Super Intelligence? (Bostrom)