Vacuum has friction from an effect similar to the casimir effect
The phenomenon of vacuum friction for spinning objects is somewhat different than for the static parallel plates: the accelerating charges in a spinning conductive object interact with the vacuum fluctuations and can emit photons.
A quick scan of the paper (pdf) indicates that the thermally radiated photons have a different net angular momentum than the ones absorbed from the reservoir, i.e. the effect is that the emitted light has a net polarization which carries off the angular momentum as the particle slows down.
Is there any electrically conductive body whose equator spins at an appreciable fraction of lightspeed and can be observed? Aside from millisecond pulsars, no. If only there were an amazingly precise clock whose anomalously accelerated spin-down and bright emissions would be analytically detectable, like millisecond pulsars.
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