I2C bus:

http://www.geocities.com/SiliconValley/9504/mic_b000.htm
  General overview

http://kar10.kar.elf.stuba.sk/~balogh/MM/i2c/i2cindex.htm
  I2C FAQ

http://ftp.philipsmcu.com
  Many example programs. Search for I2C.

In 2.1.95 and later, there seems to be a I2C driver.

http://www.sandpile.org/80x86/manuals1.shtml has several SMBus documents,
but they can not be downloaded :-(
  system management bus specification 1.0 (02/95)
  system management bus BIOS interface specification 1.0 (02/95)
  system management bus specification addendum 0.95 (05/96)
  system management bus and I2C bus design 1.0 (04/97)

Most of these can be downloaded from http://www.sbs-forum.org/specs.htm

http://www.national.com/
  LM75/78/79/80 docs

http://www.winbond.com.tw/
  Winbond docs

http://www.lysator.liu.se/~alla/files/lm78_stuff/
  Alex' updates

http://Stimpy.netroedge.com/intranet/tellerstats/
  Phil's web-based lm78 monitor

http://www.netroedge.com/~lm78
  Our official homepage.

http://users.ox.ac.uk/~kebl0850/wmlm78/
  Homepage of wmlm78, a graphical monitor under X.
