Microsoft has released the Reactive Extensions (Rx) v1.0.10621 SP1 which is available for download from Microsoft Download Center .
Reactive Extensions (Rx) is a library that lets the developers to compose synchronous and event based programs using observable reactive data sequences and LINQ style operators .
The Reactive Extensions can target .NET Framework 3.5 SP1 , .NET Framework 4.0 , Silverlight 4/5 and Windows Phone 7/7.1 .
Download Reactive Extensions (Rx) v1.0.10621 SP1 here
