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FPGA's 101 - Amazing New FPGA in Embedded Book

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overview
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In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world – possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it. The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation. I/O devices are used by a person (or other system) to communicate with a computer. For instance, keyboards and mouses are considered input devices of a computer, while monitors and printers are considered output devices of a computer. Devices for communication between computers, such as modems and network cards, typically serve for both input and output. Source: Wikipedia (http://en.wikipedia.org/wiki/Input/output)

Here are the best overviews and tutorials for io:

tutorial, 4 stars
The Digital I/O Handbook from Sealevel Systems, Inc.
Renowned technical author Jon Titus and the President and CEO of Sealevel Systems, Tom O'Hanlan, clearly explain real-world digital input/output implementation from both a hardware and software perspective. Whether you are a practicing engineer or a student, The Digital I/O Handbook will provide helpful insight you will use again and again. Covers a wide range of devices including optically isolated inputs, relays, and sensors Shows many...

tutorial, 3 stars
Pentek Tutorials - DSP, Data Acquisition, PMC, etc.
Tutorials - ( top ) Are VMEbus & VME64X Really Compatible? Backplane Wiring Know How C-Language Programming for DSP Compact PCI Voltage (I/O) and VMEbus/Compact PCI Connectors: Keeping 'Em Straight Designing a 256-Channel Digital Downconverter Designing High-Speed Data Acquisition Systems on VMEbus Digital Receivers Bring DSP to Radio Frequencies FPGAs for Software Radio FPGAs Tackle DSP Applictions for Communications...

overview, 3 stars
The I/O Bus (PCI and PCI-Express)
The CPU, memory, disks, and all the other devices in a computer have to be able to communicate and exchange data. The technology that connects them is called the 'Bus'. In the first IBM PC, the Bus was just a set of wires that ran through the mainboard. Everything connected to this one Bus and operated at one clock speed. Soon, however, the CPU had to run much faster than anything else, and the memory had to be faster than any I/O device. ...

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