It’s gone in the new Ubuntu (blame Gnome). Used up by a resize handle. Which I don’t want. Apparently, there’s a way to get rid of this, see here. Untested for now!
Edit: tested, it works. To recap: make sure the following is in your $HOME/.gtkrc-2.0:
style "default-style" { GtkWindow::resize-grip-height = 0 GtkWindow::resize-grip-width = 0 } class "GtkWidget" style "default-style"