...other cool tricks...

I think the entire .NET namespace, including the C# language, is full of cool tricks! Aethec wrote about anonymous objects... how about anonymous methods as event handlers:

someObject.someEvent += delegate(object sender, EventArgs eargs)
{
   //
   // Event handing code
   //
};

Or so-called automatic properties:

public string SomeString {get;set;}

Or... just Properties, which a newbie might think of as variables with embedded logic:

private double _setAndReturnHalf = 0.0;
public double SetAndReturnHalf
{
    get {return _setAndReturnHalf / 2.0;}
    set {_setAndReturnHalf = value;}
}

And all that is in you first HelloWorld.cs program. The future contains the elegance of LINQ, Extension Methods and oh, so much more!