OK, I guess we got lucky with Alex because she pretty much figured out potty training easily and very rarely had accidents. Now for the fun part: potty training a boy.
Sam is 3 and 1/2 and has actually peed in the potty ONCE in his life, that I know of, and that was about 6 months ago. We weren't worried, and didn't push it. But I just couldn't stand the image of him in diapers at his 4th birthday party. So we talked it up, got him all ready, bought him the big boy underwear, gave him lots of practice sessions, read potty books, watched potty videos, and finally almost 2 weeks ago we took away the diapers (except for nighttime and naps). We've promised him the moon and then some if he ever succeeds. No luck. Have found NOTHING that motivates him. Not candy, not trips to the store for prizes, not videos, nothing.
I've heard a lot of people say "Don't worry, you never see kids going to kindergarten still wearing diapers." Well, with my luck my kid will be the one.