Microsoft Silverlight

Microsoft Silverlight is the next generation, cross browser web client, cross platform runtime. Silverlight is a lightweight subset of XAML for building rich media experiences on the web.

http://www.microsoft.com/silverlight/

Visual Studio 2008

you can download the VS 2005 and SQL Server 2008 Express Edition from here :

http://www.microsoft.com/express/download/#webInstall