It's important in today's technological world, to at least expose kids to online learning and fun before they enter kindergarten. This will allow them to not only learn how to use a computer but also expose them early to necessary reading and math skills.
My own kids love technology! I try to limit how much they use, however, I love that they enjoy learning!
Below are some great sites that are completely appropriate and easy for the little kiddos in our lives! If you have any more, feel free to share those as well! I'm also including some general resources for Preschoolers.