This is an interesting question, N.. Thanks for asking it! I've been intrigued by the answers, too.
I have two girls, ages 2 and 4. We don't keep any candy in the house. I think this is why my 4 year old LOVES going to birthday parties ... the first thing she asks is "will there be cupcakes?" LOL And she has only been to 2 parties in the last 6 months.
They do love "snack time", but that is usually a few goldfish crackers or a graham cracker.
The "sweetest" thing they eat is yogurt or chocolate covered raisins which I put in there lunch about twice a week. They only get about 5 or 6 of them.
If you are trying to "wean" your kids off sweets, I have a couple of ideas I've gotten from cookbooks.
First, I would start small. Take a look at a hi-fat item and replace it a lo-fat version.
Second, get the kids involved! I find this to be extremely helpful, especially when I want my girls to try something new. I take them to the store with me, let them pick out new fruits/veggies to try, and if possible let them help me prepare the meal. It takes TIME to do this, but it is easier than trying to get a kid to eat something you've prepared AND you're less likely to toss something that wasn't touched by a picky eater.
There are wonderful cookbooks for all ages of children. I do think it's important to get them involved in the cooking so they have a variety of tastes and a knowledge of healthy eating.
Good luck, N.!