If you like to keep a weed-free lawn, you are not going to like what Daniel has to say. Dandelions are the model lawn weed, and there are many reasons why they are so successful. In other words, you will never defeat them.
But hey, if you can’t beat them, eat them. Casey lists some of the many benefits to having dandelions around. Not only are they edible (and nutritious for humans), they are also a great source of food for bees. And they may also be good for your lawn. Go figure.
More about dandelions: