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Google Desktop 3 beta still has the sidebar with widget-style plug-ins that can automatically track things like weather, traffic, air fares, and news, but version 3 lets you share your sidebar content with friends. And screen space-constrained users will appreciate the ability to break off individual components of the sidebar and move or resize them.

Fluid couplings have been used for decades in a variety of applications, including early automobiles, and they can transmit about 95 percent of the input torque to the turbine's output shaft. But the automotive torque converter wasn't developed until the late 1940s. It has one additional component, a stator, which is a third set of stationary blades mounted at the hub of the turbine. As the fluid exits the turbine on its return trip to the impeller, the stator blades reflect the fluid back to the turbine blades in the direction of rotation. This adds energy to the turbine. As long as impeller speed is greater than turbine speed, this extra step in the fluid path actually multiplies the torque being transmitted through the coupling.

Overheard, at brunch: two tech entrepreneur types discussing World of Warcraft. What server are you on? What guild? Oh yeah, me too, I heard it's a good way to schmooze.