  At present, ten years after they were first discovered, ten accreting
millisecond pulsars are known. I present a study of the aperiodic X-ray
variability in three of these systems, which led to the discovery of
simultaneous kHz quasi periodic oscillations in XTE J1807-294 and extremely
strong broadband noise at unusually low variability frequencies in IGR
J00291+5934. Furthermore, we classified SWIFT J1756.9-2508 as an atoll source
and measured in its 2007 outburst spectral and variability properties typical
of the extreme island state. I also give detailed estimates of the total
fluence during the studied outbursts.
