WaveBPS:
Overview
Navigation
Live Capture
Cursors
Importing
Exporting
Decoder Setup
Analysis
Automated Test
Specifications

FlexRay:
Overview
Static Frame
Dynamic Frame
Wakeup

Startup
Physical Layer
Compare to CAN and LIN

CAN Bus:
Overview
Data Frame
Extended Frame
Remote Frame
CAN Bus Errors
Bit Stuffing
Physical Layers
Single Wire CAN
Compare to LIN and FlexRay

LIN Bus
Overview
LIN Frame
LIN Header
LIN Slave Part
LIN Errors
Compare to CAN and FlexRay

Others:
Overview
UART: Kline, J1708 and RS232
J1850
SPI
I2C

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I2C or SMBus

I2C or SMBus bus is a peripheral interface used for communications between devices in embedded electronics. More at Wikipedia.

The I2C Bus uses two lines to communicate bi-directional data. (click for a larger picture).