New Features in VB 9.0 and C# 3.0

The following is a list of some new language-specific features available to C# 3.0 and VB 9.0, available in Visual Studio 2008, including Express editions.

Both VB and C#:
Extension methods
Anonymous Types
Local variable type inference
Object Initializers
Automatic properties
Lambda Expressions
Partial methods in VB and C#

VB Only:

Relaxed Delegate Conversion
Option Infer

More info:
1. Overview of C# 3.0
2. Overview of Visual Basic 9.0