.NET Languages

Which one do you like? I have narrowed my choice down to Nemerle, Boo and F#. I really like Nemerle, but it's the least active of these, F# looks nice and is supported by Microsoft, Boo kinda failed to excite me, but isn't bad.

DISCUSS!

Nemerle, eh?
Does this look familiar to anyone:

class Hello {
  static Main () : void {
    System.Console.WriteLine ("Hello, world!");
  }
}