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We present the results of a combination of new stellar rotation periods andextensive information about membership in the young open clusters M35 and M34.The observations show that late-type members of both clusters divide into twodistinct groups, each with a different dependence of rotation on mass (color).We discuss these new results in the context of existing rotation data for coolstars in older clusters, with a focus on the dependence of rotation on mass andage. We mention briefly tests of rotation as an "astronomical clock"(gyrochronology), and our plans to use the Kepler space mission to pushobservations of stellar rotation periods beyond the age of the Hyades and theSun.

Young Cool Stars Divided on the Issue of Rotation