Well, my $0.02 is that you can't train your kids-- they just train you!

I also feel that potty training isn't complete until they can do all (or most) of the job themselves.
My DD was 2 when DT (also b/g) were born. She was (probably) ready to train when they were born, but with regression being so common, I didn't want to push my luck! Right after her 3rd BD she was done, and by 3 1/2, dry at night as well. I can count accidents on one hand, mostly through operator error (mine).
My twins (3) are teetering on the edge of wearing undies full time, but I don't think pull ups are much different than diapers, so I just avoid them. DD3 is very close, Mommy just needs to focus more. DS is getting there, but still needs a little more time.
IMHO, it's also a LOT different when there are 2 obstinate toddlers, as well. Either they cheer each other on, or they distract each other... makes for many damp floors!
Good luck! esp coming from someone who has been changing diapers consecutively for 5 years and 2 months (and counting down the days!!)
Elin