I too have to confess to modified CC!! After months of Riley waking every 2 hours and wanting a quick feed to go back to sleep I eventually went to Tresillian residential for 5 days. I didn't want to which is why i went for months and months with him waking that often but I was working 3 days a week and my whole life was being affected by my lack of sleep. I agree with Mads and Jodie, the techniques were as they described and after 5 days there and a couple of days back home he now sleeps 12 hours every night!!! The change in me is dramatic and also in him, until the last week or 2 he was having 2 1.5-2 hour sleeps during the day too. He was 12 months when we went but the majority of babies there were about 7 months.
I know that its not for everyone but all I can say is it worked for me.