A child-friendly website with games and encyclopedias. http://www.yahooligans.com
Students can practice MEAP like items in a game fashion. http://us.educationcity.com/home/us/
This is a great site for parents to visit the everyday mathematics program used here in our district. http://everydaymath.uchicago.edu/parents/index.shtml
This website has some free downloadable books and activities that students can use for enrichment. It also has various craft activities for holidays for younger students. You can join the website for a small fee for access to all of the materials. http://www.enchantedlearning.com