my super simple xmonad config, works with unity2d (eg 11.10)

xmonad.hs

import XMonad
import XMonad.Config.Gnome
import XMonad.Layout.NoBorders
import XMonad.Layout.Gaps
import XMonad.Util.EZConfig
import XMonad.Hooks.ManageDocks
import XMonad.Hooks.ManageHelpers
import qualified XMonad.StackSet as W

main = xmonad $ gnomeConfig { terminal = "gnome-terminal"
                            , layoutHook  = myLayouts $ smartBorders $ layoutHook gnomeConfig
                            , normalBorderColor = myNormalBorderColor
                            , focusedBorderColor = myFocusedBorderColor
                            , borderWidth = myBorderWidth
                            , manageHook = manageHook gnomeConfig <+> myManageHook
                            , workspaces = myWorkspaces
                          } `additionalKeys` keyBindings

myNormalBorderColor = "#1f1f1f"
myFocusedBorderColor = "#F07746"
myBorderWidth = 2
keyBindings = [((mod1Mask, xK_l), spawn "exe=`dmenu_path | dmenu -i -nb '#464646' -nf '#ccc' -sb '#ccc' -sf '#464646' -b` && exec $exe")
              ,((mod1Mask, xK_i), spawn "gnome-terminal -t Irssi -x irssi")]

myManageHook = composeAll . concat $
            [ [className =? "Unity-2d-panel"    --> doIgnore ]
            , [className =? "Unity-2d-launcher" --> doIgnore ]
            , [ className =? b --> doF (W.shift "web") | b <- myClassWebShifts]
            , [ className =? "Emacs" --> doF (W.shift "emacs") ]
            , [ className =? "Skype" --> doSideFloat NW ]
            , [ className =? "Gnome-terminal" --> doF (W.shift "term") ]
            , [ stringProperty "WM_ICON_NAME" =? "Irssi" --> doF (W.shift "irssi")]]
    where
      myClassWebShifts    = ["Firefox", "Chromium-browser"]

myLayouts = gaps [(U, 24)]
myWorkspaces = [ "web", "emacs", "term", "irssi", "virtualbox", "misc"]