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+The Reactive Extensions (Rx) is a library for composing asynchronous
+and event-based programs using observable sequences and LINQ-style
+query operators. Using Rx, developers represent asynchronous data
+streams with Observables , query asynchronous data streams using LINQ
+operators , and parameterize the concurrency in the asynchronous data
+streams using Schedulers . Simply put, Rx = Observables + LINQ +
+Schedulers.
+
+Whether you are authoring a traditional desktop or web-based
+application, you have to deal with asynchronous and event-based
+programming from time to time. Desktop applications have I/O
+operations and computationally expensive tasks that might take a long
+time to complete and potentially block other active
+threads. Furthermore, handling exceptions, cancellation, and
+synchronization is difficult and error-prone.
+
+Using Rx, you can represent multiple asynchronous data streams (that
+come from diverse sources, e.g., stock quote, tweets, computer events,
+web service requests, etc., and subscribe to the event stream using
+the IObserver<T> interface. The IObservable<T> interface notifies the
+subscribed IObserver<T> interface whenever an event occurs.
+
+Because observable sequences are data streams, you can query them
+using standard LINQ query operators implemented by the Observable
+extension methods. Thus you can filter, project, aggregate, compose
+and perform time-based operations on multiple events easily by using
+these standard LINQ operators. In addition, there are a number of
+other reactive stream specific operators that allow powerful queries
+to be written.  Cancellation, exceptions, and synchronization are also
+handled gracefully by using the extension methods provided by Rx.
+
+To learn more about the Reactive Extensions, see Microsoft's 
+RX open source site:
+
+   http://rx.codeplex.com