Minha configuração do Xmonad com Unity no Ubuntu 12.04

xmonad-unity-session.desktop

# /usr/share/xsession/

[Desktop Entry]
Name=XMonad Unity
Comment=Tiling window manager
TryExec=/usr/bin/gnome-session
Exec=gnome-session --session=xmonad
Type=XSession

xmonad.desktop

# /usr/share/applications

[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=Xmonad
Exec=xmonad
NoDisplay=true
X-GNOME-WMName=Xmonad
X-GNOME-Autostart-Phase=WindowManager
X-GNOME-Provides=windowmanager
X-GNOME-Autostart-Notify=true

xmonad.hs

import XMonad
import XMonad.Config.Gnome
import XMonad.Hooks.ManageDocks
import XMonad.Util.EZConfig
import XMonad.Layout.Gaps
import Data.List

-- Configuração Simples
-- main = xmonad defaultConfig
--     { modMask = mod4Mask    -- Use Super instead of Alt
--     , terminal = "terminator"
--     , normalBorderColor = "#CCCCCC"
--     , focusedBorderColor = "#CD8B00"
--     }

myManageHook = composeAll . concat $
   [ [ className =? "Firefox-bin" --> doShift "6:ff" ]
   , [ className =? "Firefox" --> doShift "6:ff" ]
   , [(className =? "Firefox" <&&> resource =? "Dialog") --> doFloat]
   , [ className =? "chromium-browser" --> doShift "1:chrome" ]
   , [(className =? "chromium-browser" <&&> resource =? "Dialog") --> doFloat]
   , [ className =? "gvim" --> doShift "2:code" ]
   , [ className =? "terminator" --> doShift "3:console" ]
   , [ className =? "vlc" --> doShift "7:video" ]
   ]

myLayouts = gaps [(U, 0)] $ layoutHook gnomeConfig

main = xmonad $ gnomeConfig
         { workspaces = ["1:chrome","2:code","3:console","4:server","5:mail","6:ff","7:video","8","9","0","-","="]
         , manageHook = myManageHook <+> manageHook gnomeConfig
         , modMask = mod4Mask
         , layoutHook = myLayouts
         , terminal = "terminator"
         , focusFollowsMouse = False
         }
         `additionalKeysP`
            -- DMenu
            [ ("M-p", spawn "dmenu_run")
            -- Shutdown
            , ("M-S-q", spawn "gnome-session-quit --power-off")
            -- Lock Screen
            , ("M-S-l", spawn "gnome-screensaver-command -l")
            -- Logout
            , ("M1-M-S-l", spawn "gnome-session-save --gui --kill")
            -- Reboot
            , ("M1-S-,", spawn "gnome-power-cmd.sh reboot")
            ]

xmonad.session

# /usr/share/gnome-session/sessions

[GNOME Session]
Name=Xmonad Unity
RequiredComponents=gnome-settings-daemon;
RequiredProviders=windowmanager;
DefaultProvider-windowmanager=xmonad