Thinkfinity's Parent Resources--Excellent, free resources and information for parents
A Family's Guide: Fostering Your Child's Success in School Mathematics--from Illuminations
What Can Family Literacy Look Like--from NCTE (National Council of Teachers of English)
Elementary School Reading Benchmarks for Parents--Fun resource for parents to see if they know what a child should be able to do at each grade level--K-3. Then it goes over what each child should be able to do by the end of each grade. Very informative, easy to read.