I always said Mike would have to take the lead in potty training Ethan. I may have grown up in a third world country, and my years in the Army may have trained me to deal with not-so-favorable "potty" conditions... but I know squat about the first thing in teaching someone how to "point and shoot" -- although I understand the cheerio-target-practice might come much later.
We introduced his potty chair about 2 weeks ago. We put it right next to the toilet in the upstairs bathroom, and he knows what it is because he goes and sits on it everytime we say the word "potty". Every time he poops, he points at his butt. He just turned 19 months, but we figured it's probably never too early to introduce him to the concept.
We encourage him to sit on it before his baths and sometimes in the mornings before changing for daycare... he even pretends to flush after he gets up from it. Do we think he's ready? Hardly. I've heard of miraculous "trainers" getting the job done in a week -- someone at work had even suggested me taking a week off to potty train him. Frankly, I think he'll do it when he's ready. Right now, we just take it day by day... even if that song on his potty is super annoying.
At least my boy knows how to wipe! :)