These are some of my favorite hyperlinks.

http://www.enchantedlearning.com/subjects/dinosaurs/index.html

http://www.abcteach.com/

http://teachercorner.com/holidays.html

http://www.riverdeep.net/

http://www.funbrain.com/

http://www.janbrett.com/

http://www.learning.caliberinc.com/grade1.html

http://www.coolmath4kids.com/

http://www.coloringbookfun.com/

http://www.literacycenter.net/

http://www.thecrayonhouse.com/

http://www.flamingtext.com/buttons/