A Tour of Visual Studio 2008 and the .NET Framework 3.5
In Visual Studio 2008, unit testing tools will be available in Professional Edition and not only in Enterprise, like in VS 2005.
Daniel made a demo which interested me a lot! Developing add-ins for Microsoft Office 2007. VS 2008 has a visual tool for Ribbon design, for example. A new feature of both C# and VB9 is the local type inference. This means that you don’t have to declare a type for a variable, because the compiler will analyze the code and set it into the correct type. You can declare a variable, assign an integer value (having intellisense for integer variables) and then assign a string (having intellisense for string values from that line on).
There is some syntactic sugar for C# as in-line functions (for example to assign a delegate without declaring a function), object initializers (when creating an object declare the default values for public properties). These features are compatible with .NET Framework 2.0, because the compiler creates the suitable IL definition.