R.,
You have gotten a lot of good responses, but I just wanted to put my 2 sense in.
I started potty training my daughter on her 2nd birthday. We had issues in the beginning (especially popping) but I had to hide the diapers and pull-ups. We told her that they were for babies. Daycare probably wasn't to happy with me sending her there with just panties but they were really encouraging her. She had 3 accidents the 1st day and had fewer and fewer each day after for about a week. It is now 2 months later she is fully potty trained at home, out in public, at night, poppy and potty, everywhere and she is one of the few kids in her class that is.
We did give her candy every time she went, then switched to everytime she went poppy, and now it is every time she goes by herself. We also bought her a Girl Potty book, at the end it says do you want to be a big girl now and she always loves that part and screams Yes!
Good luck, and my advice it get rid of the diapers and only put them on at night if you have to. We started with a diaper and her panties on top at night and it worked well.
M.