My mother-in-law used this method with all of her kids and still talks about how well it worked for them (my husband is still perfectly potty-trained, so I can confidently say this system gives lasting results). But if you don't want to take Carrie's word for it, read through all of the positive reviews and decide for yourself if this could be the best system for your family.
Promising review: "We started potty training two weeks ago with this plan, and it’s been nearly a week since my 26-month-old son has had an accident! I did my best to stick 100% to her plan, and succeeded at actually doing so at maybe 90–95%. (I fudged a little on both TV time and outside play time within the first two days, and was rewarded with accidents both times! She knows what she’s talking about.) It was very helpful to spend a week getting prepped, going cold turkey and diving in headfirst, basically. On day one, my son had never even sat on his potty seat before and was scared of it, but by the end of day one he’d peed in the toilet a couple times (and on the floor many times more!), but we stuck pretty close to the plan and by day three he was pooping in the toilet and having far fewer accidents. Now it’s been two weeks and he’s gotten in great control of all the muscles involved in 'holding it' — it’s been amazing to watch him figure his body out! He likes to know what the rules are and wants to make us proud. Seriously, if you’re a reasonably disciplined and determined parent, this plan really can work, if you dedicate yourself to doing it by the book! We are two weeks diaper-free and loving it." —Meg
Get it from Amazon for $9.76.