http://www.sheldonbrown.com/cribsheet-spacing.html
Yeah. I'm too thick to get it tho.
Would an 8 speed Shimano brifter pull an 8 speed campag rear mech the right distance?
And does 0.1mm actually matter IRL anyway?
You can mix & match in some circumstances, but you'd have to search for "shimergo" to see if what you have will work.
There's a thread on here, but the definitive resource is on CTC.
@Hefty started
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http://www.sheldonbrown.com/cribsheet-spacing.html