A gapless tiled layout that attempts to obey window size hints, rather than simply ignoring them.

You can use this module with the following in your xmonad.hs:

import XMonad.Layout.HintedTile

Then edit your layoutHook by adding the HintedTile layout:

myLayout = hintedTile Tall ||| hintedTile Wide ||| Full ||| etc..
  where
     hintedTile = HintedTile nmaster delta ratio TopLeft
     nmaster    = 1
     ratio      = 1/2
     delta      = 3/100
main = xmonad def { layoutHook = myLayout }

Because both Xmonad and Xmonad.Layout.HintedTile define Tall, you need to disambiguate Tall. If you are replacing the built-in Tall with HintedTile, change import Xmonad to import Xmonad hiding (Tall).

For more detailed instructions on editing the layoutHook see the tutorial and XMonad.Doc.Extending.