Tile/Arrange options in Window menu

Most MDI apps have options for arranging windows:

 Tile: restores and resizes windows into squares and lays them out in a grid
 Arrange vertically: restores and resizes windows so they take up the full height of the client but split the horizontal space
 Arrange horizontally: restores and resizes windows so they take up the full width of the client but split the vertical space

It'd be nice if we could implement those, or something similar (or better!)