http://www.parktool.com/repair/readhowto.asp?id=75
Also, it's
possible that the chain is zinging against the inboard side of the big chainring when you're in the extreme small-small combo. I've noticed this on one of my bikes. Trimming the FD via the shifter doesn't make a difference, but shifting to the next-to-smallest cog makes it disappear (as does shifting to the big chainring).
It's a different kind of sound, though. Instead of the "brrrr brrr" you'd get with FD rub, it has a "grriing grriiing" sound, at least on my Shimano and Sugino cranks, as the chain nicks the pins on the big ring.