S.W.
Hi E.,
I just started letting my kids online (my daughter is in 1st grade) and as a browser I use firefox, they have this awesome extension called Glubble that adds into fire fox. It has a parental profile and lets you create profiles for your kids as well, then it lists relevant websites for the age group. What I love the most is it closes out firefox and opens the kid browser, and if kids close it, it will ask for the master password before any sites can be visited on the regular internet. You also have the ability to add in websites (like webkinz) and can keep track of the sites they visit. I probably didnt give a good description, so here is the website: http://www.glubble.com/ and best of all its 100% free.
Hope this helps, I know it has been a life saver for me
S.