Here are some great websites to check out at home with your 1st grader:
Science: Foss Web
http://www.fossweb.com/modulesK-2/index.html
Starfall
http://www.starfall.com/
Math Expressions: Grade 1
http://www.eduplace.com/math/mthexp/g1/index.html
Tumble Books
http://www.tumblebooks.com/library/asp/customer_login.asp?accessdenied=%2Flibrary%2Fasp%2Fhome%5Ftumblebooks%2Easp