X11 1.4.3 has been released:
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/X11-1.4.3
This version is now required due to gwern's "XPaste" patch. xmonad packagers
should take steps to update to this new version in order to be ready for xmonad
0.9.
Cheers,
Spencer Janssen