S.
I agree with Kelly Emily. Keep the experience positive. They will go when they are ready. My son just celebrated his 3rd Birthday in January. He started going to the potty in November 08 but started daycare. I wouldn't even have to ask him but when he started daycare he stopped going on his own and I saw why. They forced them to go even when he didn't need to go. He's not in daycare anymore and he's fully potty trained, even at night.
I allowed him to wet in his pants and told him that we all have accidents and that it was ok. But when he was wearing favorite underwear and had to change out of them, he didn't like it. I bought him cute little spiderman undies and tighty whities too! When he had an accident he had to put on tighty whities, which he didn't like so he did his best to stay dry. We also went to do the potty dance which can be found on www.dothepottydance.com When he started going on his own, I awarded him with a ribbon that I bought from the dollar tree. Rewards always work!