Reactive Extensions for .NET (Rx) released this week during PDC09. Rx uses Parallel Extensions for .NET (Px) for all of it's concurrent and parallel computing needs. How is it using Px, specifically? What's going on here and why?  Stephen Toub, PM on the Px team, and Wes Dyer, developer on the Rx team, tell us all about this partnership the experience of collaborating on two very compatible technologies that, taken together, create something beautiful. Some many xs, so little time. Enjoy....