The .NET Framework 3.0 is Microsoft's managed code programming model. It is a superset of the .NET Framework 2.0, combining .NET Framework 2.0 components with new technologies for building applications that have visually stunning user experiences, seamless and secure communication, and the ability to model a range of business processes. In addition to the .NET Framework 2.0, it includes Windows Presentation Foundation (WPF), Windows Workflow Foundation (WF), Windows Communication Foundation (WCF), and Windows CardSpace.
Net 3.0 is an add-on to .Net 2.0. It contains three
Libraries for Windows
Presentation Foundation (WPF), Windows Workflow Foundation
(WF) and Windows
Communication Foundation (WCF) (and Windows Cardspace).
You can use these in
Visual Studio 2005 by adding extensions.
.Net 3.5 is the next .Net version after 2.0 shipped with
Visual Studio 2008
.NET 3.5 has LINQ, ASP.NET AJAX, new controls, richer WCF support, and a few other features that aren't in .NET 3.0. For server/asp.net scenarios I'd probably always recommend going with .NET 3.5. For client scenarios, .NET 3.0 is interesting to target since is pre-installed on all versions of Windows Vista - so you have good deployment of the runtime.
Note that all applications that target .NET 3.0 or .NET 2.0 will work run on .NET 3.5. You can't use the new features in .NET 3.5 if you target .NET 3.0 - but your application will obviously still work
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