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@number6
i have this happen on about half my bikes -
in no particular order - here's the options as i see it
a loose (or worn) BB
b loose (or ill fitting) chainring bolts
c knackered pedal
d loose crank bolt (ie. bolt that holds crank to BB)
e ill fitting cranks (taper is wrong or more likley taper on crank or BB axle is worn - i've seen this happen when someone rides with a loose crank bolt and the tapers round off)
g loose cleat or creaky shoe
f - after all this i've still had it - the soulution was to remove crank and grease the taper slightly - it's often very small movements in the crank around the taper (something that over torquing and almost stripping the thread on the crank bolt didn't cure) - make sure you tighten those crank bolts tight - this is actually a likely cause - if it's not this get your knees and ankles checked out