Visual Studio Async CTP extends Visual Studio 2010. It provides streamlined syntax for asynchronous development in C# and Visual Basic.
Microsoft Visual Studio Async CTP (SP1 Refresh)
Download a CTP with new syntax and APIs for asynchronous development.
New! The SP1 refresh includes Visual Studio 2010 SP1 compatibility, APIs for Windows Phone 7 development, and a new EULA with updates regarding usage in production environments. It is compatible with non-English installations of Visual Studio and with Visual Studio Express.