I used the technique in the article NSM linked to, and a bit of the no-cry-sleep-solution, and a bit of Baby Whisperer all cobbled together.
Until almost 4 weeks ago, DD2 was sleeping in a bedside cot as a sidecar, waking 7-8 times a night, after spending until 11pm feeding on me downstairs (she was nearly 11 months old).
Night 1: Fed her whenever she woke, then from 5am onwards, refused to feed, but gave her big cuddles, and hugs with reassurance. Told her she was a big girl now, and I knew she could do it. Took 1 hour to settle, but more ranty than crying. Never left her or ignored her.
Night 2: Same as night 1, but took 45 minutes to settle.
Night 3: Same as night 2, but stopped feeding from 3am. Took 30 minutes to settle.
Night 4: as night 3.
Night 5: No feeds after midnight.
Then no feeds after she fell asleep in my arms about 9pm.
Two weeks ago today, I stopped breastfeeding all together. She has slept upstairs from 19.00 until 06.00, with only one or two brief wakings.
One week ago, I decided to put her in her cot with the side up, and she now sleeps through the night!
We still have a way to go, as she needs someone with her to go to sleep at the moment, but she is gradually getting more attached to her 'lovey' (A Dumbo holding a little blanket, all in a soft furry material), and we hope to move her into her own bedroom in the next month or two, and move towards her being able to wind down on her own in her room, and self settle.