We opted to use elimination communication (not toilet training) i.e offering our children the use of a potty from a very young age.
We did this with our 2 year old DD, starting at 10 weeks old and I have just started recently with our month old DS.
I do this as it is nice for the baby/child to have an option to be dry and clean and it is much nicer for me to offer the potty/toilet than changing dirty nappies all the time.
In the baby's case it is much easier. He wee's after every nap without fail, so I can either wait until he has done his wee and do a full nappy change OR hold him over the potty for 30 seconds and put him back into his dry nappy again.
He is still a baby....he doesn't have to sit in wee in order to be a baby (and he is a totally wonderful baby )
Bottom line we all do what is right for our own children, including EC or toilet training at whatever age suit us and our children.
Interesting Article about Toilet Training
From similar recent thread