Free Computer Books

Intelligentedu.com lists a collection of free computer books for programming, networking, neural network, OS, so on and so on. It take days to figure out those documentations which I need.
Postponed one exam, molecular model building, to the next exam session in September: I need time to remember the structures of the 20 amino acids.......
And Apple discontinued its single-processor PowerMac G5 in favor of an all dual-chip lineup.