I2C vs. SMBus

I think there are more experts on uk.d-i-y than here on this subject!

SMBus is the System Management Bus defined by Intel Corporation in

1995. It is used in mobile and desktop personal computers for low-speed communication in the system. The I2C bus and the SMBus are popular 2-wire buses that are essentially compatible with each other. Complete compatibility between both buses is ensured only below 100kHz.

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Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at 
http://www.epanorama.net/

Thanks.

Too true. uk.diy is one of the most helpful groups I subscribe to.