Anonymous function syntax

[Max Klyga]

Actually Scala doesn't need type declarations in labmda literals. Most 
of the time argument types are infered. It would be awesome if D 
infered argument types for labdas too.
Also Java 8 adopted the same lambda syntax as Scala and C#.

To add a few things to your list:

Nemerle
    fun (x, y) { x + y }
    (x, y) => x + y

Scala and Nemerle supports placeholder lambda syntax
    _ + _

Scheme
    (lambda (x y) (+ x y))

Smalltalk
    [ :x :y | x + y ]

ML/Ocaml/F#
    fun x y -> x + y

Ruby has a whole zoo of syntaxes
    {|x, y| x + y }
    ->(x, y) { x + y }
    do |x, y| x + y end

Groovy
    { x, y -> x + y }

So "(args) => body" is the most common syntax now