I also used Elizabeth Pantley's book when I wanted to stop DD feeding to sleep when I returned to work at 12 months, it worked really well, I took her off just before she was asleep but drowsy and rocked her to sleep, each day taking her off sooner so eventually I just rocked her to sleep.

I agree with the other ladies though, don't stop it because you feel like you 'shouldn't' be doing it, it's perfectly fine even if others around you don't agree (been there!).