Interesting to see this thread again!
Given my post above, I thought I might add that I have had two bouts of CC with DD since I wrote it.
The first was when she was around 7 months and it was simply to encourage her to settle in her cot at bedtime. She had become increasingly unwilling to unlatch and go to sleep and had self-weaned from her dummy, preferring the real thing. Although I've done some co-sleeping with DD, it's far from ideal from the point of view of my own sleep, especially as DD will only really do it if she can stay latched on the whole time.
Anyway, after two days and a maximum of 25mins of intermittent protesting (DD never went into meltdown, thankfully) DD let me put her into her cot and fell asleep without a peep.
That was the result I wanted, so I didn't pursue overnight wakings at that point. However, the overnight wakings did decrease dramatically from 5-6 to 2-3 and then 1-2 a couple of months later.
DD began sleeping through without further intervention at 13 months.
However, the sleeping through remained intermittent and the overnight waking was getting more prolonged when it happened, so we did some more CC at almost 19 months.
Basically, DD was fully night-weaned (she'd only been after comfort feeds, in any case) and DH did any resettling, starting with 2 mins of waiting, then 5 then 7 etc. We only needed to do it three times in the course of a couple of weeks.
At 20 months, DD is now fully weaned, bedtime BF and all, and goes down fine at bedtime and now only wakes in the night if she has a genuine issue (illness or, for example, she was hot two nights ago - DH went into her and she basically told him she wanted a drink of water and her cardigan off, once he'd done that, she ASKED to be put back in her cot. Whereupon, she went straight back to sleep).
It was relatively untraumatic for all concerned, including DD who didn't cry all that much, mainly just called out a bit.
Once in a while we get an early waking (pre 06.00) where DD can't get back to sleep, but otherwise I would say doing a bit of CC has been largely effective and the whole family is better rested as a result.