Kids decide when they're ready. You can only encourage and offer the opportunity. I thought my boys would be in college before they got out of diapers. If he wakes up dry, bring him to the potty. But they decide that they're ready and off they go. Praise praise praise. My oldest boy also went through a stage where he was too busy to potty regressed.

What worked for my daughter (who in all honesty trained herself before she was a year old) was buying special panties. She did not want to pee in Minnie mouse so she'd tell me during the day. Nap time and at night she still needed a diaper until she was almost 2. I tried Power Ranger undies for the boys they just didn't care, didn't seem to have the ability to know when it was coming until they were older.