PCI - Peripheral component interconnect
PCI Special Interest Group
PCI Industrial Computer Manufacturers Group

PCI-33 (33MHz, 32bit, 5.0V)
PCI-66 (33MHz, 64bit, 5.0V)
PCI-66 (66MHz, 64bit, 3.3V)
PCI-X 1.0 (133MHz, IBM, HP, Compaq)
PCI-X 2.0 (2x133MHz, 4x133MHz)

PCI-Express - former 3GIO / NGIO / TGIO / Future I/O, 2.5GB/s
  Arapahoe (IBM, Dell, Compaq, intel, Microsoft, 3com, AMD), PCI / PCI-X based
  Future I/O (IBM, HP, Compaq, adaptec, 3com, Cisco), point-to-point, PCI-X based, 1GB/s, Parallel link
  NGIO Next generation I/O (intel, Dell, SUN, Siemens, NEC, Hitachi), point-to-point, GBit Ethernet 200MB/s, Serial link
  TGIO / 3GIO (Third generation I/O [intel])
  PCI-Express 1x [4pin] 500MB/s
  PCI-Express 2x [8pin] 1GB/s
  PCI-Express 4x [16pin] 2GB/s
  PCI-Express 8x [32pin] 4GB/s
  PCI-Express 16x [64pin] 8GB/s
  PCI-Express Advanced Switching (ASI SIG)

Infiniband (see www.infinibandta.org) SUN, intel, serial link 2.5GBit/s, server interconnect

HyperTransport (HyperTransport Technology Consortium)
HyperTransport v1.0x (1.6GB/s per pin, 2-32bit, 200-800MHz, Dual Data rate)
HyperTransport v1.1 (v1.0x w/ native packet handling, peer-to-peer, Virtual Channels, retry protocol
HyperTransport v2.0 (2.8GB/s per pin, 2-64bit, 1000-1400MHz, Dual Data rate, PCI-Express compliant)

Rapid I/O (see www.rapidio.org)

CompactPCI
IndustrialPCI
SmallPCI

PCI 1.0 spec
PCI 2.0 spec (1993)
PCI 2.1 spec (1994, Concurrent PCI, 64bit / 66MHz)
PCI 2.2 spec (1999, Power Management, Hot-Plug)
PCI 2.3 spec (2002, LowProfile, SMBus)
PCI X rev 1.0 spec
PCI Express x16 Graphics 150W-ATX spec v1.0
PCI hot plug spec v1.0
PCI-PCI bridge rev 1.1 spec
   
intel PCI specification

PCI ID (Vendor ID, Device ID, SubSystem ID)

PCI slots
MoBo edge PCI-33
33 / 32bit 5.0V
PCI-66
33 / 64bit 5.0V
PCI-66
66 / 64bit 3.3V
   
PCI 5.0V
PCI 3.3V
PCI 3.3V