I stopped nursing at night, and DH went in when the kids woke. After a few nights of that, both kids just stopped waking up.
With DS, I tried doing it gradually by pushing the nursing cut off earlier, and the next nursing later, but he'd slowly start waking more frequently. It was only when I stopped nursing completely that he actually slept. With DD I stopped cold turkey and it took a few nights. I did wait until she was only waking twice a night though.
Amanda - happily married wife to N
and mother to B