Amy and I decided to potty train Elizabeth. She's only 21 months old, but when she joined our family at 11 months old, she was already trained pretty well. In China, starting at just a few months old, they put children on the toilet at regular intervals and leave them there until they pee. When they start going, the adults whistle, and the Pavlovian effect takes hold. Pretty soon, they can set the kids on the pot, whistle, and viola - potty time!
We made Andrew go cold turkey (no more diapers - period) when he was 2 and a half years old. Over a 3-day weekend, he learned quickly that he didn't like being soaked in urine. We started the same technique on Elizabeth 2 days ago (except for overnight - she still needs a diaper then), with mixed results. To top it all off, Amy took off with some girlfriends for the weekend and left me in charge of potty patrol. Liz makes it to the toilet about half the time, but in a single 1-hour period this afternoon, I had to clean up 3 accidents - meaning 3 changes of clothes for Elizabeth, and me too.
C'est la vie!