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I was recently asked to detail the various .net and Silverlight versions in a simple table - here's my attempt (this is all available at www.asp.net/downloads but I must admit I found it useful to try and summarise the essentials here)

Version Released Tools Summary Comments
.net 1.1 2003 VS 2003 You can only use Visual Studio 2003 to work with .net 1.1 apps
.net 2.0 2005 VS 2005/VS 2008 You can target .net 2 with VS 2008
.net 3.0 2006 VS 2005/VS 2008

You will need to install the .net 3 tool support for VS 2005 separately - it is included in VS 2008.

.Net 3 includes:

  • Windows Presentation Foundation (WPF)
  • Windows Communication Foundation (WCF)
  • Windows Workflow Foundation (WF)
  • Windows CardSpace

Tools for VS 2005:

.net 3.5 2008 VS 2008

Silverlight 1.0 2007 VS 2008 with tool Support for code.
Expression Blend 2 for UI design

Silverlight UI with XAML, JavaScript for interaction.  See Silverlight Feature Matrix for more details.

Silverlight 1.1 Alpha 2007 Discontinued - use Silverlight 2.0 Beta instead  
Silverlight 2.0
Beta
2008 VS 2008 with tool Support for code
Expression Blend 2.5 Preview
Silverlight UI with XAML, rich controls, managed code. 

See Silverlight Feature Matrix for more details.

Asp.Net 3.5
extensions
Preview
2008 VS 2008 with add-on

This preview adds new features for asp.net that sit on top of .net 3.5 (confusingly some of the assemblies in the preview are versioned as 3.6)

The new features include:

 

Hope this helps.

Cheers

Ian