My wife and I got this method online - it cost us $26 - that is suppose to work in three days.  I was skeptical, but it worked.  The basic idea revolves around total inculcation.  I'll give you the rundown for free:

-  You (OR your lovely, beautiful, super-understanding wife) need set aside EVERYTHING for three days. 

-  Get rid of your diapers.  It's "underwear mode" from the moment you start.

-  You load your kid up with tons of liquids, and you check their status to need to use the potty every five minutes. 

-  You never ask them "do you need to potty?" but rather, tell them "let me know if you need to go potty." 

-  Buy lots of underwear.  20 sets might just do it.  Be prepared to deal with lots of accidents.  It usually works best to have him/her not wear pants.

-  Be positive.  Reward good behavior.  When accidents happen, let them know it's GROSS, because it is.  Don't laugh about it.

-  After a while, if he/she hasn't gone potty, go anyway.

-  Training diapers are a total waste of money.  Get rid of them.

-  No liquids 2 hours before they go to bed.  Wake them up 2-3 times to go potty.  1/2 hour after they go to bed, and 1/2 hour before they get up works best.

It isn't easy, but knocking it out nice and quick is so much better than beating your head against the wall.  If you want the full discourse (it only takes 30-45 minutes to read, and $26 is cheap compared to the diapers you'll spend money on) go to:

3DayPottyTraining.com

I was very fortunate, as my youngest and my oldest both potty-trained themselves.  Bottom line: With my other kids, my mindset was that I knew that they would not be walking up the aisle at their wedding wearing diapers, so I just trained as I could, and didn't put any pressure on my kids.  I felt that there are enough problems the kids had to deal with, with life in general, without adding pressure to a situation that the kids WILL eventually resolve as they grow older.